diff --git a/src/common/notifier/notification_handler.go b/src/common/notifier/notification_handler.go
new file mode 100644
index 000000000..5d4508aa3
--- /dev/null
+++ b/src/common/notifier/notification_handler.go
@@ -0,0 +1,15 @@
+package notifier
+
+//NotificationHandler defines what operations a notification handler
+//should have.
+type NotificationHandler interface {
+	//Handle the event when it coming.
+	//value might be optional, it depends on usages.
+	Handle(value interface{}) error
+
+	//IsStateful returns whether the handler is stateful or not.
+	//If handler is stateful, it will not be triggerred in parallel.
+	//Otherwise, the handler will be triggered concurrently if more
+	//than one same handler are matched the topics.
+	IsStateful() bool
+}
diff --git a/src/common/notifier/notifier.go b/src/common/notifier/notifier.go
new file mode 100644
index 000000000..5b92247ff
--- /dev/null
+++ b/src/common/notifier/notifier.go
@@ -0,0 +1,228 @@
+package notifier
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"strings"
+	"sync"
+
+	"github.com/vmware/harbor/src/common/utils/log"
+)
+
+//HandlerIndexer is setup the relationship between the handler type and
+//instance.
+type HandlerIndexer map[string]NotificationHandler
+
+//Notification wraps the topic and related data value if existing.
+type Notification struct {
+	//Topic of notification
+	//Required
+	Topic string
+
+	//Value of notification.
+	//Optional
+	Value interface{}
+}
+
+//HandlerChannel provides not only the chan itself but also the count of
+//handlers related with this chan.
+type HandlerChannel struct {
+	//To indicate how many handler instances bound with this chan.
+	boundCount uint32
+
+	//The chan for controling concurrent executions.
+	channel chan bool
+}
+
+//NotificationWatcher is defined to accept the events published
+//by the sender and match it with pre-registered notification handler
+//and then trigger the execution of the found handler.
+type NotificationWatcher struct {
+	//For handle concurrent scenario.
+	*sync.RWMutex
+
+	//To keep the registered handlers in memory.
+	//Each topic can register multiple handlers.
+	//Each handler can bind to multiple topics.
+	handlers map[string]HandlerIndexer
+
+	//Keep the channels which are used to control the concurrent executions
+	//of multiple stateful handlers with same type.
+	handlerChannels map[string]*HandlerChannel
+}
+
+//notificationWatcher is a default notification watcher in package level.
+var notificationWatcher = NewNotificationWatcher()
+
+//NewNotificationWatcher is constructor of NotificationWatcher.
+func NewNotificationWatcher() *NotificationWatcher {
+	return &NotificationWatcher{
+		new(sync.RWMutex),
+		make(map[string]HandlerIndexer),
+		make(map[string]*HandlerChannel),
+	}
+}
+
+//Handle the related topic with the specified handler.
+func (nw *NotificationWatcher) Handle(topic string, handler NotificationHandler) error {
+	if strings.TrimSpace(topic) == "" {
+		return errors.New("Empty topic is not supported")
+	}
+
+	if handler == nil {
+		return errors.New("Nil handler can not be registered")
+	}
+
+	defer nw.Unlock()
+	nw.Lock()
+
+	t := reflect.TypeOf(handler).String()
+	if indexer, ok := nw.handlers[topic]; ok {
+		if _, existing := indexer[t]; existing {
+			return fmt.Errorf("Topic %s has already register the handler with type %s", topic, t)
+		}
+
+		indexer[t] = handler
+	} else {
+		newIndexer := make(HandlerIndexer)
+		newIndexer[t] = handler
+		nw.handlers[topic] = newIndexer
+	}
+
+	if handler.IsStateful() {
+		//First time
+		if handlerChan, ok := nw.handlerChannels[t]; !ok {
+			nw.handlerChannels[t] = &HandlerChannel{1, make(chan bool, 1)}
+		} else {
+			//Already have chan, just increase count
+			handlerChan.boundCount++
+		}
+	}
+
+	return nil
+}
+
+//UnHandle is to revoke the registered handler with the specified topic.
+//'handler' is optional, the type name of the handler. If it's empty value,
+//then revoke the whole topic, otherwise only revoke the specified handler.
+func (nw *NotificationWatcher) UnHandle(topic string, handler string) error {
+	if strings.TrimSpace(topic) == "" {
+		return errors.New("Empty topic is not supported")
+	}
+
+	defer nw.Unlock()
+	nw.Lock()
+
+	var revokeHandler = func(indexer HandlerIndexer, handlerType string) bool {
+		//Find the specified one
+		if hd, existing := indexer[handlerType]; existing {
+			delete(indexer, handlerType)
+			if len(indexer) == 0 {
+				//No handler existing, then remove topic
+				delete(nw.handlers, topic)
+			}
+
+			//Update channel counter or remove channel
+			if hd.IsStateful() {
+				if theChan, yes := nw.handlerChannels[handlerType]; yes {
+					theChan.boundCount--
+					if theChan.boundCount == 0 {
+						//Empty, then remove the channel
+						delete(nw.handlerChannels, handlerType)
+					}
+				}
+			}
+
+			return true
+		}
+
+		return false
+	}
+
+	if indexer, ok := nw.handlers[topic]; ok {
+		if strings.TrimSpace(handler) == "" {
+			for t := range indexer {
+				revokeHandler(indexer, t)
+			}
+
+			return nil
+		}
+
+		//Revoke the specified handler.
+		if revokeHandler(indexer, handler) {
+			return nil
+		}
+	}
+
+	return fmt.Errorf("Failed to revoke handler %s with topic %s", handler, topic)
+}
+
+//Notify that notification is coming.
+func (nw *NotificationWatcher) Notify(notification Notification) error {
+	if strings.TrimSpace(notification.Topic) == "" {
+		return errors.New("Empty topic can not be notified")
+	}
+
+	nw.RLock()
+	defer nw.RUnlock()
+
+	var (
+		indexer  HandlerIndexer
+		ok       bool
+		handlers = []NotificationHandler{}
+	)
+	if indexer, ok = nw.handlers[notification.Topic]; !ok {
+		return fmt.Errorf("No handlers registered for handling topic %s", notification.Topic)
+	}
+
+	for _, h := range indexer {
+		handlers = append(handlers, h)
+	}
+
+	//Trigger handlers
+	for _, h := range handlers {
+		var handlerChan chan bool
+
+		if h.IsStateful() {
+			t := reflect.TypeOf(h).String()
+			handlerChan = nw.handlerChannels[t].channel
+		}
+		go func(hd NotificationHandler, ch chan bool) {
+			if hd.IsStateful() && ch != nil {
+				ch <- true
+			}
+			go func() {
+				defer func() {
+					if hd.IsStateful() && ch != nil {
+						<-ch
+					}
+				}()
+				if err := hd.Handle(notification.Value); err != nil {
+					//Currently, we just log the error
+					log.Errorf("Error occurred when triggerring handler %s of topic %s: %s\n", reflect.TypeOf(hd).String(), notification.Topic, err.Error())
+				}
+			}()
+		}(h, handlerChan)
+	}
+
+	return nil
+}
+
+//Subscribe is a wrapper utility method for NotificationWatcher.handle()
+func Subscribe(topic string, handler NotificationHandler) error {
+	return notificationWatcher.Handle(topic, handler)
+}
+
+//UnSubscribe is a wrapper utility method for NotificationWatcher.UnHandle()
+func UnSubscribe(topic string, handler string) error {
+	return notificationWatcher.UnHandle(topic, handler)
+}
+
+//Publish is a wrapper utility method for NotificationWatcher.notify()
+func Publish(topic string, value interface{}) error {
+	return notificationWatcher.Notify(Notification{
+		Topic: topic,
+		Value: value,
+	})
+}
diff --git a/src/common/notifier/notifier_test.go b/src/common/notifier/notifier_test.go
new file mode 100644
index 000000000..4d3499a9d
--- /dev/null
+++ b/src/common/notifier/notifier_test.go
@@ -0,0 +1,142 @@
+package notifier
+
+import (
+	"reflect"
+	"testing"
+	"time"
+)
+
+var statefulData int
+
+type fakeStatefulHandler struct {
+	number int
+}
+
+func (fsh *fakeStatefulHandler) IsStateful() bool {
+	return true
+}
+
+func (fsh *fakeStatefulHandler) Handle(v interface{}) error {
+	increment := 0
+	if v != nil && reflect.TypeOf(v).Kind() == reflect.Int {
+		increment = v.(int)
+	}
+	statefulData += increment
+	return nil
+}
+
+type fakeStatelessHandler struct{}
+
+func (fsh *fakeStatelessHandler) IsStateful() bool {
+	return false
+}
+
+func (fsh *fakeStatelessHandler) Handle(v interface{}) error {
+	return nil
+}
+
+func TestSubscribeAndUnSubscribe(t *testing.T) {
+	err := Subscribe("topic1", &fakeStatefulHandler{0})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = Subscribe("topic1", &fakeStatelessHandler{})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = Subscribe("topic2", &fakeStatefulHandler{0})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = Subscribe("topic2", &fakeStatelessHandler{})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(notificationWatcher.handlers) != 2 {
+		t.Fail()
+	}
+
+	if indexer, ok := notificationWatcher.handlers["topic1"]; !ok {
+		t.Fail()
+	} else {
+		if len(indexer) != 2 {
+			t.Fail()
+		}
+	}
+
+	if len(notificationWatcher.handlerChannels) != 1 {
+		t.Fail()
+	}
+
+	err = UnSubscribe("topic1", "*notifier.fakeStatefulHandler")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = UnSubscribe("topic2", "*notifier.fakeStatefulHandler")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(notificationWatcher.handlerChannels) != 0 {
+		t.Fail()
+	}
+
+	err = UnSubscribe("topic1", "")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(notificationWatcher.handlers) != 1 {
+		t.Fail()
+	}
+
+	err = UnSubscribe("topic2", "")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(notificationWatcher.handlers) != 0 {
+		t.Fail()
+	}
+}
+
+func TestPublish(t *testing.T) {
+	err := Subscribe("topic1", &fakeStatefulHandler{0})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = Subscribe("topic2", &fakeStatefulHandler{0})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(notificationWatcher.handlers) != 2 {
+		t.Fail()
+	}
+
+	Publish("topic1", 100)
+	Publish("topic2", 50)
+
+	//Waiting for async is done
+	<-time.After(1 * time.Second)
+
+	if statefulData != 150 {
+		t.Fatalf("Expect execution result %d, but got %d", 150, statefulData)
+	}
+
+	err = UnSubscribe("topic1", "*notifier.fakeStatefulHandler")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = UnSubscribe("topic2", "*notifier.fakeStatefulHandler")
+	if err != nil {
+		t.Fatal(err)
+	}
+}
diff --git a/src/common/notifier/scan_policy_notitification_handler.go b/src/common/notifier/scan_policy_notitification_handler.go
new file mode 100644
index 000000000..56c1bf885
--- /dev/null
+++ b/src/common/notifier/scan_policy_notitification_handler.go
@@ -0,0 +1,72 @@
+package notifier
+
+import (
+	"errors"
+	"reflect"
+
+	"time"
+
+	"github.com/vmware/harbor/src/common/scheduler"
+	"github.com/vmware/harbor/src/common/scheduler/policy"
+	"github.com/vmware/harbor/src/common/scheduler/task"
+)
+
+const (
+	//PolicyTypeDaily specify the policy type is "daily"
+	PolicyTypeDaily = "daily"
+
+	alternatePolicy = "Alternate Policy"
+)
+
+//ScanPolicyNotification is defined for pass the policy change data.
+type ScanPolicyNotification struct {
+	//Type is used to keep the scan policy type: "none","daily" and "refresh".
+	Type string
+
+	//DailyTime is used when the type is 'daily', the offset with UTC time 00:00.
+	DailyTime int64
+}
+
+//ScanPolicyNotificationHandler is defined to handle the changes of scanning
+//policy.
+type ScanPolicyNotificationHandler struct{}
+
+//IsStateful to indicate this handler is stateful.
+func (s *ScanPolicyNotificationHandler) IsStateful() bool {
+	//Policy change should be done one by one.
+	return true
+}
+
+//Handle the policy change notification.
+func (s *ScanPolicyNotificationHandler) Handle(value interface{}) error {
+	if value == nil {
+		return errors.New("ScanPolicyNotificationHandler can not handle nil value")
+	}
+
+	if reflect.TypeOf(value).Kind() != reflect.Struct ||
+		reflect.TypeOf(value).String() != "notifier.ScanPolicyNotification" {
+		return errors.New("ScanPolicyNotificationHandler can not handle value with invalid type")
+	}
+
+	notification := value.(ScanPolicyNotification)
+
+	hasScheduled := scheduler.DefaultScheduler.HasScheduled(alternatePolicy)
+	if notification.Type == PolicyTypeDaily {
+		if !hasScheduled {
+			schedulePolicy := policy.NewAlternatePolicy(&policy.AlternatePolicyConfiguration{
+				Duration:   24 * time.Hour,
+				OffsetTime: notification.DailyTime,
+			})
+			attachTask := task.NewScanAllTask()
+			schedulePolicy.AttachTasks(attachTask)
+
+			return scheduler.DefaultScheduler.Schedule(schedulePolicy)
+		}
+	} else {
+		if hasScheduled {
+			return scheduler.DefaultScheduler.UnSchedule(alternatePolicy)
+		}
+	}
+
+	return nil
+}
diff --git a/src/common/notifier/scan_policy_notitification_handler_test.go b/src/common/notifier/scan_policy_notitification_handler_test.go
new file mode 100644
index 000000000..46efffbe5
--- /dev/null
+++ b/src/common/notifier/scan_policy_notitification_handler_test.go
@@ -0,0 +1,54 @@
+package notifier
+
+import (
+	"testing"
+	"time"
+
+	"github.com/vmware/harbor/src/common/scheduler"
+)
+
+var testingScheduler = scheduler.DefaultScheduler
+
+func TestScanPolicyNotificationHandler(t *testing.T) {
+	//Scheduler should be running.
+	testingScheduler.Start()
+	if !testingScheduler.IsRunning() {
+		t.Fatal("scheduler should be running")
+	}
+
+	handler := &ScanPolicyNotificationHandler{}
+	if !handler.IsStateful() {
+		t.Fail()
+	}
+
+	utcTime := time.Now().UTC().Unix()
+	notification := ScanPolicyNotification{"daily", utcTime + 3600}
+	if err := handler.Handle(notification); err != nil {
+		t.Fatal(err)
+	}
+
+	//Waiting for everything is ready.
+	<-time.After(1 * time.Second)
+	if !testingScheduler.HasScheduled("Alternate Policy") {
+		t.Fatal("Handler does not work")
+	}
+
+	notification2 := ScanPolicyNotification{"none", 0}
+	if err := handler.Handle(notification2); err != nil {
+		t.Fatal(err)
+	}
+
+	//Waiting for everything is ready.
+	<-time.After(1 * time.Second)
+	if testingScheduler.HasScheduled("Alternate Policy") {
+		t.Fail()
+	}
+
+	//Clear
+	testingScheduler.Stop()
+	//Waiting for everything is ready.
+	<-time.After(1 * time.Second)
+	if testingScheduler.IsRunning() {
+		t.Fatal("scheduler should be stopped")
+	}
+}
diff --git a/src/common/notifier/topics.go b/src/common/notifier/topics.go
new file mode 100644
index 000000000..869ff1055
--- /dev/null
+++ b/src/common/notifier/topics.go
@@ -0,0 +1,11 @@
+package notifier
+
+import (
+	"github.com/vmware/harbor/src/common"
+)
+
+//Define global topic names
+const (
+	//ScanAllPolicyTopic is for notifying the change of scanning all policy.
+	ScanAllPolicyTopic = common.ScanAllPolicy
+)
diff --git a/src/common/scheduler/policy/alternate_policy.go b/src/common/scheduler/policy/alternate_policy.go
new file mode 100644
index 000000000..38a20e92f
--- /dev/null
+++ b/src/common/scheduler/policy/alternate_policy.go
@@ -0,0 +1,154 @@
+package policy
+
+import (
+	"errors"
+	"time"
+
+	"github.com/vmware/harbor/src/common/scheduler/task"
+)
+
+//AlternatePolicyConfiguration store the related configurations for alternate policy.
+type AlternatePolicyConfiguration struct {
+	//Duration is the interval of executing attached tasks.
+	Duration time.Duration
+
+	//OffsetTime is the execution time point of each turn
+	//It's a number to indicate the seconds offset to the 00:00 of UTC time.
+	OffsetTime int64
+}
+
+//AlternatePolicy is a policy that repeatedly executing tasks with specified duration during a specified time scope.
+type AlternatePolicy struct {
+	//Keep the attached tasks.
+	tasks []task.Task
+
+	//Policy configurations.
+	config *AlternatePolicyConfiguration
+
+	//Generate time ticks with specified duration.
+	ticker *time.Ticker
+
+	//To indicated whether policy is completed.
+	isEnabled bool
+
+	//Channel used to send evaluation result signals.
+	evaluation chan bool
+
+	//Channel used to notify policy termination.
+	done chan bool
+
+	//Channel used to receive terminate signal.
+	terminator chan bool
+}
+
+//NewAlternatePolicy is constructor of creating AlternatePolicy.
+func NewAlternatePolicy(config *AlternatePolicyConfiguration) *AlternatePolicy {
+	return &AlternatePolicy{
+		tasks:     []task.Task{},
+		config:    config,
+		isEnabled: false,
+	}
+}
+
+//GetConfig returns the current configuration options of this policy.
+func (alp *AlternatePolicy) GetConfig() *AlternatePolicyConfiguration {
+	return alp.config
+}
+
+//Name is an implementation of same method in policy interface.
+func (alp *AlternatePolicy) Name() string {
+	return "Alternate Policy"
+}
+
+//Tasks is an implementation of same method in policy interface.
+func (alp *AlternatePolicy) Tasks() []task.Task {
+	copyList := []task.Task{}
+	if alp.tasks != nil && len(alp.tasks) > 0 {
+		copyList = append(copyList, alp.tasks...)
+	}
+
+	return copyList
+}
+
+//Done is an implementation of same method in policy interface.
+func (alp *AlternatePolicy) Done() <-chan bool {
+	return alp.done
+}
+
+//AttachTasks is an implementation of same method in policy interface.
+func (alp *AlternatePolicy) AttachTasks(tasks ...task.Task) error {
+	if tasks == nil || len(tasks) == 0 {
+		return errors.New("No tasks can be attached")
+	}
+
+	alp.tasks = append(alp.tasks, tasks...)
+
+	return nil
+}
+
+//Disable is an implementation of same method in policy interface.
+func (alp *AlternatePolicy) Disable() error {
+	//Stop the ticker
+	if alp.ticker != nil {
+		alp.ticker.Stop()
+	}
+
+	//Stop the evaluation goroutine
+	alp.terminator <- true
+	alp.ticker = nil
+
+	return nil
+}
+
+//Evaluate is an implementation of same method in policy interface.
+func (alp *AlternatePolicy) Evaluate() (<-chan bool, error) {
+	//Keep idempotent
+	if alp.isEnabled && alp.evaluation != nil {
+		return alp.evaluation, nil
+	}
+
+	alp.done = make(chan bool)
+	alp.terminator = make(chan bool)
+	alp.evaluation = make(chan bool)
+
+	go func() {
+		defer func() {
+			alp.isEnabled = false
+		}()
+		timeNow := time.Now().UTC()
+
+		//Reach the execution time point?
+		utcTime := (int64)(timeNow.Hour()*3600 + timeNow.Minute()*60)
+		diff := alp.config.OffsetTime - utcTime
+		if diff < 0 {
+			diff += 24 * 3600
+		}
+		if diff > 0 {
+			//Wait for a while.
+			select {
+			case <-time.After(time.Duration(diff) * time.Second):
+			case <-alp.terminator:
+				return
+			}
+		}
+
+		//Trigger the first tick.
+		alp.evaluation <- true
+
+		//Start the ticker for repeat checking.
+		alp.ticker = time.NewTicker(alp.config.Duration)
+		for {
+			select {
+			case <-alp.ticker.C:
+				alp.evaluation <- true
+			case <-alp.terminator:
+				return
+			}
+		}
+	}()
+
+	//Enabled
+	alp.isEnabled = true
+
+	return alp.evaluation, nil
+}
diff --git a/src/common/scheduler/policy/alternate_policy_test.go b/src/common/scheduler/policy/alternate_policy_test.go
new file mode 100644
index 000000000..5340b04eb
--- /dev/null
+++ b/src/common/scheduler/policy/alternate_policy_test.go
@@ -0,0 +1,114 @@
+package policy
+
+import (
+	"testing"
+	"time"
+)
+
+type fakeTask struct {
+	number int
+}
+
+func (ft *fakeTask) Name() string {
+	return "for testing"
+}
+
+func (ft *fakeTask) Run() error {
+	ft.number++
+	return nil
+}
+
+func TestBasic(t *testing.T) {
+	tp := NewAlternatePolicy(&AlternatePolicyConfiguration{})
+	err := tp.AttachTasks(&fakeTask{number: 100})
+	if err != nil {
+		t.Fail()
+	}
+
+	if tp.GetConfig() == nil {
+		t.Fail()
+	}
+
+	if tp.Name() != "Alternate Policy" {
+		t.Fail()
+	}
+
+	tks := tp.Tasks()
+	if tks == nil || len(tks) != 1 {
+		t.Fail()
+	}
+
+}
+
+func TestEvaluatePolicy(t *testing.T) {
+	now := time.Now().UTC()
+	utcOffset := (int64)(now.Hour()*3600 + now.Minute()*60)
+	tp := NewAlternatePolicy(&AlternatePolicyConfiguration{
+		Duration:   1 * time.Second,
+		OffsetTime: utcOffset + 1,
+	})
+	err := tp.AttachTasks(&fakeTask{number: 100})
+	if err != nil {
+		t.Fail()
+	}
+	ch, _ := tp.Evaluate()
+	counter := 0
+
+	for i := 0; i < 3; i++ {
+		select {
+		case <-ch:
+			counter++
+		case <-time.After(2 * time.Second):
+			continue
+		}
+	}
+
+	if counter != 3 {
+		t.Fail()
+	}
+
+	tp.Disable()
+}
+
+func TestDisablePolicy(t *testing.T) {
+	now := time.Now().UTC()
+	utcOffset := (int64)(now.Hour()*3600 + now.Minute()*60)
+	tp := NewAlternatePolicy(&AlternatePolicyConfiguration{
+		Duration:   1 * time.Second,
+		OffsetTime: utcOffset + 1,
+	})
+	err := tp.AttachTasks(&fakeTask{number: 100})
+	if err != nil {
+		t.Fail()
+	}
+	ch, _ := tp.Evaluate()
+	counter := 0
+	terminate := make(chan bool)
+	defer func() {
+		terminate <- true
+	}()
+	go func() {
+		for {
+			select {
+			case <-ch:
+				counter++
+			case <-terminate:
+				return
+			case <-time.After(6 * time.Second):
+				return
+			}
+		}
+	}()
+	time.Sleep(2 * time.Second)
+	if tp.Disable() != nil {
+		t.Fatal("Failed to disable policy")
+	}
+	//Waiting for everything is stable
+	<-time.After(1 * time.Second)
+	//Copy value
+	copiedCounter := counter
+	time.Sleep(2 * time.Second)
+	if counter != copiedCounter {
+		t.Fatalf("Policy is still running after calling Disable() %d=%d", copiedCounter, counter)
+	}
+}
diff --git a/src/common/scheduler/policy/policy.go b/src/common/scheduler/policy/policy.go
new file mode 100644
index 000000000..ad11cf5df
--- /dev/null
+++ b/src/common/scheduler/policy/policy.go
@@ -0,0 +1,39 @@
+package policy
+
+import (
+	"github.com/vmware/harbor/src/common/scheduler/task"
+)
+
+//Policy is an if-then logic to determine how the attached tasks should be
+//executed based on the evaluation result of the defined conditions.
+//E.g:
+//  Daily execute TASK between 2017/06/24 and 2018/06/23
+//  Execute TASK at 2017/09/01 14:30:00
+//
+//Each policy should have a name to identify itself.
+//Please be aware that policy with no tasks will be treated as invalid.
+//
+type Policy interface {
+	//Name will return the name of the policy.
+	Name() string
+
+	//Tasks will return the attached tasks with this policy.
+	Tasks() []task.Task
+
+	//AttachTasks is to attach tasks to this policy
+	AttachTasks(...task.Task) error
+
+	//Done will setup a channel for other components to check whether or not
+	//the policy is completed. Possibly designed for the none loop policy.
+	Done() <-chan bool
+
+	//Evaluate the policy based on its definition and return the result via
+	//result channel. Policy is enabled after it is evaluated.
+	//Make sure Evaluate is idempotent, that means one policy can be only enabled
+	//only once even if Evaluate is called more than one times.
+	Evaluate() (<-chan bool, error)
+
+	//Disable the enabled policy and release all the allocated resources.
+	//Disable should also send signal to the terminated channel which returned by Done.
+	Disable() error
+}
diff --git a/src/common/scheduler/scheduler.go b/src/common/scheduler/scheduler.go
new file mode 100644
index 000000000..3073f6343
--- /dev/null
+++ b/src/common/scheduler/scheduler.go
@@ -0,0 +1,265 @@
+package scheduler
+
+import (
+	"github.com/vmware/harbor/src/common/scheduler/policy"
+	"github.com/vmware/harbor/src/common/utils/log"
+
+	"errors"
+	"fmt"
+	"reflect"
+	"strings"
+	"time"
+)
+
+const (
+	defaultQueueSize = 10
+
+	statSchedulePolicy   = "Schedule Policy"
+	statUnSchedulePolicy = "Unschedule Policy"
+	statTaskRun          = "Task Run"
+	statTaskComplete     = "Task Complete"
+	statTaskFail         = "Task Fail"
+)
+
+//StatItem is defined for the stat metrics.
+type StatItem struct {
+	//Metrics catalog
+	Type string
+
+	//The stat value
+	Value uint32
+
+	//Attach some other info
+	Attachment interface{}
+}
+
+//StatSummary is used to collect some metrics of scheduler.
+type StatSummary struct {
+	//Count of scheduled policy
+	PolicyCount uint32
+
+	//Total count of tasks
+	Tasks uint32
+
+	//Count of successfully complete tasks
+	CompletedTasks uint32
+
+	//Count of tasks with errors
+	TasksWithError uint32
+}
+
+//Configuration defines configuration of Scheduler.
+type Configuration struct {
+	QueueSize uint8
+}
+
+//Scheduler is designed for scheduling policies.
+type Scheduler struct {
+	//Related configuration options for scheduler.
+	config *Configuration
+
+	//Store to keep the references of scheduled policies.
+	policies Store
+
+	//Queue for accepting the scheduling polices.
+	scheduleQueue chan policy.Policy
+
+	//Queue for receiving policy unschedule request or complete signal.
+	unscheduleQueue chan string
+
+	//Channel for receiving stat metrics.
+	statChan chan *StatItem
+
+	//Channel for terminate scheduler damon.
+	terminateChan chan bool
+
+	//The stat metrics of scheduler.
+	stats *StatSummary
+
+	//To indicate whether scheduler is running or not
+	isRunning bool
+}
+
+//DefaultScheduler is a default scheduler.
+var DefaultScheduler = NewScheduler(nil)
+
+//NewScheduler is constructor for creating a scheduler.
+func NewScheduler(config *Configuration) *Scheduler {
+	var qSize uint8 = defaultQueueSize
+	if config != nil && config.QueueSize > 0 {
+		qSize = config.QueueSize
+	}
+
+	sq := make(chan policy.Policy, qSize)
+	usq := make(chan string, qSize)
+	stChan := make(chan *StatItem, 4)
+	tc := make(chan bool, 1)
+
+	store := NewConcurrentStore()
+	return &Scheduler{
+		config:          config,
+		policies:        store,
+		scheduleQueue:   sq,
+		unscheduleQueue: usq,
+		statChan:        stChan,
+		terminateChan:   tc,
+		stats: &StatSummary{
+			PolicyCount:    0,
+			Tasks:          0,
+			CompletedTasks: 0,
+			TasksWithError: 0,
+		},
+		isRunning: false,
+	}
+}
+
+//Start the scheduler damon.
+func (sch *Scheduler) Start() {
+	if sch.isRunning {
+		return
+	}
+	go func() {
+		defer func() {
+			if r := recover(); r != nil {
+				log.Errorf("Runtime error in scheduler:%s\n", r)
+			}
+		}()
+		defer func() {
+			sch.isRunning = false
+		}()
+		for {
+			select {
+			case <-sch.terminateChan:
+				//Exit
+				return
+			case p := <-sch.scheduleQueue:
+				//Schedule the policy.
+				watcher := NewWatcher(p, sch.statChan, sch.unscheduleQueue)
+
+				//Keep the policy for future use after it's successfully scheduled.
+				sch.policies.Put(p.Name(), watcher)
+
+				//Enable it.
+				watcher.Start()
+
+				sch.statChan <- &StatItem{statSchedulePolicy, 1, nil}
+			case name := <-sch.unscheduleQueue:
+				//Find the watcher.
+				watcher := sch.policies.Remove(name)
+				if watcher != nil && watcher.IsRunning() {
+					watcher.Stop()
+				}
+
+				sch.statChan <- &StatItem{statUnSchedulePolicy, 1, nil}
+
+			case stat := <-sch.statChan:
+				{
+					switch stat.Type {
+					case statSchedulePolicy:
+						sch.stats.PolicyCount += stat.Value
+						break
+					case statUnSchedulePolicy:
+						sch.stats.PolicyCount -= stat.Value
+						break
+					case statTaskRun:
+						sch.stats.Tasks += stat.Value
+						break
+					case statTaskComplete:
+						sch.stats.CompletedTasks += stat.Value
+						break
+					case statTaskFail:
+						sch.stats.TasksWithError += stat.Value
+						break
+					default:
+						break
+					}
+					log.Infof("Policies:%d, Tasks:%d, CompletedTasks:%d, FailedTasks:%d\n",
+						sch.stats.PolicyCount,
+						sch.stats.Tasks,
+						sch.stats.CompletedTasks,
+						sch.stats.TasksWithError)
+
+					if stat.Attachment != nil &&
+						reflect.TypeOf(stat.Attachment).String() == "*errors.errorString" {
+						log.Errorf("%s: %s\n", stat.Type, stat.Attachment.(error).Error())
+					}
+				}
+
+			}
+		}
+	}()
+
+	sch.isRunning = true
+	log.Infof("Policy scheduler start at %s\n", time.Now().UTC().Format(time.RFC3339))
+}
+
+//Stop the scheduler damon.
+func (sch *Scheduler) Stop() {
+	if !sch.isRunning {
+		return
+	}
+
+	//Terminate damon firstly to stop receiving signals.
+	sch.terminateChan <- true
+
+	//Stop all watchers.
+	for _, wt := range sch.policies.GetAll() {
+		wt.Stop()
+	}
+
+	//Clear resources
+	sch.policies.Clear()
+
+	log.Infof("Policy scheduler stop at %s\n", time.Now().UTC().Format(time.RFC3339))
+}
+
+//Schedule and enable the policy.
+func (sch *Scheduler) Schedule(scheduledPolicy policy.Policy) error {
+	if scheduledPolicy == nil {
+		return errors.New("nil is not Policy object")
+	}
+
+	if strings.TrimSpace(scheduledPolicy.Name()) == "" {
+		return errors.New("Policy should be assigned a name")
+	}
+
+	tasks := scheduledPolicy.Tasks()
+	if tasks == nil || len(tasks) == 0 {
+		return errors.New("Policy must attach task(s)")
+	}
+
+	if sch.policies.Exists(scheduledPolicy.Name()) {
+		return fmt.Errorf("Duplicated policy: %s", scheduledPolicy.Name())
+	}
+
+	//Schedule the policy.
+	sch.scheduleQueue <- scheduledPolicy
+
+	return nil
+}
+
+//UnSchedule the specified policy from the enabled policies list.
+func (sch *Scheduler) UnSchedule(policyName string) error {
+	if strings.TrimSpace(policyName) == "" {
+		return errors.New("Empty policy name is invalid")
+	}
+
+	if !sch.policies.Exists(policyName) {
+		return fmt.Errorf("Policy %s is not existing", policyName)
+	}
+
+	//Unschedule the policy.
+	sch.unscheduleQueue <- policyName
+
+	return nil
+}
+
+//IsRunning to indicate whether the scheduler is running.
+func (sch *Scheduler) IsRunning() bool {
+	return sch.isRunning
+}
+
+//HasScheduled is to check whether the given policy has been scheduled or not.
+func (sch *Scheduler) HasScheduled(policyName string) bool {
+	return sch.policies.Exists(policyName)
+}
diff --git a/src/common/scheduler/scheduler_store.go b/src/common/scheduler/scheduler_store.go
new file mode 100644
index 000000000..9a94d3b70
--- /dev/null
+++ b/src/common/scheduler/scheduler_store.go
@@ -0,0 +1,136 @@
+package scheduler
+
+import (
+	"strings"
+	"sync"
+)
+
+//Store define the basic operations for storing and managing policy watcher.
+//The concrete implementation should consider concurrent supporting scenario.
+//
+type Store interface {
+	//Put a new policy in.
+	Put(key string, value *Watcher)
+
+	//Get the corresponding policy with the key.
+	Get(key string) *Watcher
+
+	//Exists is to check if the key existing in the store.
+	Exists(key string) bool
+
+	//Remove the specified policy and return its reference.
+	Remove(key string) *Watcher
+
+	//Size return the total count of items in store.
+	Size() uint32
+
+	//GetAll is to get all the items in the store.
+	GetAll() []*Watcher
+
+	//Clear store.
+	Clear()
+}
+
+//ConcurrentStore implements Store interface and supports concurrent operations.
+type ConcurrentStore struct {
+	//Read-write mutex to synchronize the data map.
+	*sync.RWMutex
+
+	//Map used to keep the policy list.
+	data map[string]*Watcher
+}
+
+//NewConcurrentStore is used to create a new store and return the pointer reference.
+func NewConcurrentStore() *ConcurrentStore {
+	mutex := new(sync.RWMutex)
+	data := make(map[string]*Watcher)
+
+	return &ConcurrentStore{mutex, data}
+}
+
+//Put a policy into store.
+func (cs *ConcurrentStore) Put(key string, value *Watcher) {
+	if strings.TrimSpace(key) == "" || value == nil {
+		return
+	}
+
+	defer cs.Unlock()
+
+	cs.Lock()
+	cs.data[key] = value
+}
+
+//Get policy via key.
+func (cs *ConcurrentStore) Get(key string) *Watcher {
+	if strings.TrimSpace(key) == "" {
+		return nil
+	}
+
+	defer cs.RUnlock()
+
+	cs.RLock()
+	return cs.data[key]
+}
+
+//Exists is used to check whether or not the key exists in store.
+func (cs *ConcurrentStore) Exists(key string) bool {
+	if strings.TrimSpace(key) == "" {
+		return false
+	}
+
+	defer cs.RUnlock()
+
+	cs.RLock()
+	_, ok := cs.data[key]
+
+	return ok
+}
+
+//Remove is to delete the specified policy.
+func (cs *ConcurrentStore) Remove(key string) *Watcher {
+	if !cs.Exists(key) {
+		return nil
+	}
+
+	defer cs.Unlock()
+
+	cs.Lock()
+	if wt, ok := cs.data[key]; ok {
+		delete(cs.data, key)
+		return wt
+	}
+
+	return nil
+}
+
+//Size return the total count of items in store.
+func (cs *ConcurrentStore) Size() uint32 {
+	return (uint32)(len(cs.data))
+}
+
+//GetAll to get all the items of store.
+func (cs *ConcurrentStore) GetAll() []*Watcher {
+	all := []*Watcher{}
+
+	defer cs.RUnlock()
+	cs.RLock()
+	for _, v := range cs.data {
+		all = append(all, v)
+	}
+
+	return all
+}
+
+//Clear all the items in store.
+func (cs *ConcurrentStore) Clear() {
+	if cs.Size() == 0 {
+		return
+	}
+
+	defer cs.Unlock()
+	cs.Lock()
+
+	for k := range cs.data {
+		delete(cs.data, k)
+	}
+}
diff --git a/src/common/scheduler/scheduler_store_test.go b/src/common/scheduler/scheduler_store_test.go
new file mode 100644
index 000000000..11dc1d8c2
--- /dev/null
+++ b/src/common/scheduler/scheduler_store_test.go
@@ -0,0 +1,71 @@
+package scheduler
+
+import (
+	"testing"
+)
+
+func TestPut(t *testing.T) {
+	store := NewConcurrentStore()
+	if store == nil {
+		t.Fatal("Failed to creat store instance")
+	}
+
+	store.Put("testing", NewWatcher(nil, nil, nil))
+	if store.Size() != 1 {
+		t.Fail()
+	}
+}
+
+func TestGet(t *testing.T) {
+	store := NewConcurrentStore()
+	if store == nil {
+		t.Fatal("Failed to creat store instance")
+	}
+	store.Put("testing", NewWatcher(nil, nil, nil))
+	w := store.Get("testing")
+	if w == nil {
+		t.Fail()
+	}
+}
+
+func TestRemove(t *testing.T) {
+	store := NewConcurrentStore()
+	if store == nil {
+		t.Fatal("Failed to creat store instance")
+	}
+	store.Put("testing", NewWatcher(nil, nil, nil))
+	if !store.Exists("testing") {
+		t.Fail()
+	}
+	w := store.Remove("testing")
+	if w == nil {
+		t.Fail()
+	}
+}
+
+func TestExisting(t *testing.T) {
+	store := NewConcurrentStore()
+	if store == nil {
+		t.Fatal("Failed to creat store instance")
+	}
+	store.Put("testing", NewWatcher(nil, nil, nil))
+	if !store.Exists("testing") {
+		t.Fail()
+	}
+	if store.Exists("fake_key") {
+		t.Fail()
+	}
+}
+
+func TestGetAll(t *testing.T) {
+	store := NewConcurrentStore()
+	if store == nil {
+		t.Fatal("Failed to creat store instance")
+	}
+	store.Put("testing", NewWatcher(nil, nil, nil))
+	store.Put("testing2", NewWatcher(nil, nil, nil))
+	list := store.GetAll()
+	if list == nil || len(list) != 2 {
+		t.Fail()
+	}
+}
diff --git a/src/common/scheduler/scheduler_test.go b/src/common/scheduler/scheduler_test.go
new file mode 100644
index 000000000..f038e1802
--- /dev/null
+++ b/src/common/scheduler/scheduler_test.go
@@ -0,0 +1,142 @@
+package scheduler
+
+import (
+	"testing"
+	"time"
+
+	"github.com/vmware/harbor/src/common/scheduler/task"
+)
+
+type fakePolicy struct {
+	tasks      []task.Task
+	done       chan bool
+	evaluation chan bool
+	terminate  chan bool
+	ticker     *time.Ticker
+}
+
+func (fp *fakePolicy) Name() string {
+	return "testing policy"
+}
+
+func (fp *fakePolicy) Tasks() []task.Task {
+	return fp.tasks
+}
+
+func (fp *fakePolicy) AttachTasks(tasks ...task.Task) error {
+	fp.tasks = append(fp.tasks, tasks...)
+	return nil
+}
+
+func (fp *fakePolicy) Done() <-chan bool {
+	return fp.done
+}
+
+func (fp *fakePolicy) Evaluate() (<-chan bool, error) {
+	fp.evaluation = make(chan bool, 1)
+	fp.done = make(chan bool)
+	fp.terminate = make(chan bool)
+
+	fp.evaluation <- true
+	go func() {
+		fp.ticker = time.NewTicker(1 * time.Second)
+		for {
+			select {
+			case <-fp.terminate:
+				return
+			case <-fp.ticker.C:
+				fp.evaluation <- true
+			}
+		}
+	}()
+	return fp.evaluation, nil
+}
+
+func (fp *fakePolicy) Disable() error {
+	if fp.ticker != nil {
+		fp.ticker.Stop()
+	}
+
+	fp.terminate <- true
+	return nil
+}
+
+type fakeTask struct {
+	number int
+}
+
+func (ft *fakeTask) Name() string {
+	return "for testing"
+}
+
+func (ft *fakeTask) Run() error {
+	ft.number++
+	return nil
+}
+
+//Wacher will be tested together with scheduler.
+func TestScheduler(t *testing.T) {
+	DefaultScheduler.Start()
+	if DefaultScheduler.policies.Size() != 0 {
+		t.Fail()
+	}
+
+	if DefaultScheduler.stats.PolicyCount != 0 {
+		t.Fail()
+	}
+
+	if !DefaultScheduler.IsRunning() {
+		t.Fatal("Scheduler is not started")
+	}
+
+	fp := &fakePolicy{
+		tasks: []task.Task{},
+	}
+	fk := &fakeTask{number: 100}
+	fp.AttachTasks(fk)
+
+	if DefaultScheduler.Schedule(fp) != nil {
+		t.Fatal("Schedule policy failed")
+	}
+	//Waiting for everything is stable
+	time.Sleep(1 * time.Second)
+	if DefaultScheduler.policies.Size() == 0 {
+		t.Fatal("No policy in the store after calling Schedule()")
+	}
+	if DefaultScheduler.stats.PolicyCount != 1 {
+		t.Fatal("Policy stats do not match")
+	}
+
+	time.Sleep(2 * time.Second)
+	if fk.number == 100 {
+		t.Fatal("Task is not triggered")
+	}
+	if DefaultScheduler.stats.Tasks == 0 {
+		t.Fail()
+	}
+	if DefaultScheduler.stats.CompletedTasks == 0 {
+		t.Fail()
+	}
+
+	if DefaultScheduler.UnSchedule(fp.Name()) != nil {
+		t.Fatal("Unschedule policy failed")
+	}
+	//Waiting for everything is stable
+	time.Sleep(1 * time.Second)
+
+	if DefaultScheduler.stats.PolicyCount != 0 {
+		t.Fatal("Policy count does not match after calling UnSchedule()")
+	}
+	copiedValue := DefaultScheduler.stats.CompletedTasks
+	<-time.After(2 * time.Second)
+
+	if copiedValue != DefaultScheduler.stats.CompletedTasks {
+		t.Fatalf("Policy is still enabled after calling UnSchedule(),%d=%d", copiedValue, DefaultScheduler.stats.CompletedTasks)
+	}
+
+	DefaultScheduler.Stop()
+	<-time.After(1 * time.Second)
+	if DefaultScheduler.policies.Size() != 0 || DefaultScheduler.IsRunning() {
+		t.Fatal("Scheduler is still running after stopping")
+	}
+}
diff --git a/src/common/scheduler/task/scan_all_task.go b/src/common/scheduler/task/scan_all_task.go
new file mode 100644
index 000000000..c7d70d838
--- /dev/null
+++ b/src/common/scheduler/task/scan_all_task.go
@@ -0,0 +1,23 @@
+package task
+
+import (
+	"github.com/vmware/harbor/src/ui/utils"
+)
+
+//ScanAllTask is task of scanning all tags.
+type ScanAllTask struct{}
+
+//NewScanAllTask is constructor of creating ScanAllTask.
+func NewScanAllTask() *ScanAllTask {
+	return &ScanAllTask{}
+}
+
+//Name returns the name of the task.
+func (sat *ScanAllTask) Name() string {
+	return "scan all"
+}
+
+//Run the actions.
+func (sat *ScanAllTask) Run() error {
+	return utils.ScanAllImages()
+}
diff --git a/src/common/scheduler/task/scan_all_task_test.go b/src/common/scheduler/task/scan_all_task_test.go
new file mode 100644
index 000000000..18ac9202b
--- /dev/null
+++ b/src/common/scheduler/task/scan_all_task_test.go
@@ -0,0 +1,16 @@
+package task
+
+import (
+	"testing"
+)
+
+func TestTask(t *testing.T) {
+	tk := NewScanAllTask()
+	if tk == nil {
+		t.Fail()
+	}
+
+	if tk.Name() != "scan all" {
+		t.Fail()
+	}
+}
diff --git a/src/common/scheduler/task/task.go b/src/common/scheduler/task/task.go
new file mode 100644
index 000000000..162a6501a
--- /dev/null
+++ b/src/common/scheduler/task/task.go
@@ -0,0 +1,10 @@
+package task
+
+//Task is used to synchronously run specific action(s).
+type Task interface {
+	//Name should return the name of the task.
+	Name() string
+
+	//Run the concrete code here
+	Run() error
+}
diff --git a/src/common/scheduler/watcher.go b/src/common/scheduler/watcher.go
new file mode 100644
index 000000000..feb2f7739
--- /dev/null
+++ b/src/common/scheduler/watcher.go
@@ -0,0 +1,139 @@
+package scheduler
+
+import (
+	"github.com/vmware/harbor/src/common/scheduler/policy"
+	"github.com/vmware/harbor/src/common/scheduler/task"
+	"github.com/vmware/harbor/src/common/utils/log"
+
+	"fmt"
+)
+
+//Watcher is an asynchronous runner to provide an evaluation environment for the policy.
+type Watcher struct {
+	//The target policy.
+	p policy.Policy
+
+	//The channel for receive stop signal.
+	cmdChan chan bool
+
+	//Indicate whether the watch is started and running.
+	isRunning bool
+
+	//Report stats to scheduler.
+	stats chan *StatItem
+
+	//If policy is automatically completed, report the policy to scheduler.
+	doneChan chan string
+}
+
+//NewWatcher is used as a constructor.
+func NewWatcher(p policy.Policy, st chan *StatItem, done chan string) *Watcher {
+	return &Watcher{
+		p:         p,
+		cmdChan:   make(chan bool),
+		isRunning: false,
+		stats:     st,
+		doneChan:  done,
+	}
+}
+
+//Start the running.
+func (wc *Watcher) Start() {
+	if wc.isRunning {
+		return
+	}
+
+	if wc.p == nil {
+		return
+	}
+
+	go func(pl policy.Policy) {
+		defer func() {
+			if r := recover(); r != nil {
+				log.Errorf("Runtime error in watcher:%s\n", r)
+			}
+		}()
+
+		defer func() {
+			wc.isRunning = false
+		}()
+
+		evalChan, err := pl.Evaluate()
+		if err != nil {
+			log.Errorf("Failed to evaluate ploicy %s with error: %s\n", pl.Name(), err.Error())
+			return
+		}
+		done := pl.Done()
+
+		for {
+			select {
+			case <-evalChan:
+				{
+					//Start to run the attached tasks.
+					for _, t := range pl.Tasks() {
+						go func(tk task.Task) {
+							defer func() {
+								if r := recover(); r != nil {
+									st := &StatItem{statTaskFail, 1, fmt.Errorf("Runtime error in task execution:%s", r)}
+									if wc.stats != nil {
+										wc.stats <- st
+									}
+								}
+							}()
+							err := tk.Run()
+
+							//Report task execution stats.
+							st := &StatItem{statTaskComplete, 1, err}
+							if err != nil {
+								st.Type = statTaskFail
+							}
+							if wc.stats != nil {
+								wc.stats <- st
+							}
+						}(t)
+
+						//Report task run stats.
+						st := &StatItem{statTaskRun, 1, nil}
+						if wc.stats != nil {
+							wc.stats <- st
+						}
+					}
+				}
+			case <-done:
+				{
+					//Policy is automatically completed.
+					//Report policy change stats.
+					if wc.doneChan != nil {
+						wc.doneChan <- wc.p.Name()
+					}
+
+					return
+				}
+			case <-wc.cmdChan:
+				//Exit goroutine.
+				return
+			}
+		}
+	}(wc.p)
+
+	wc.isRunning = true
+}
+
+//Stop the running.
+func (wc *Watcher) Stop() {
+	if !wc.isRunning {
+		return
+	}
+
+	//Disable policy.
+	if wc.p != nil {
+		wc.p.Disable()
+	}
+	//Stop watcher.
+	wc.cmdChan <- true
+}
+
+//IsRunning to indicate if the watcher is still running.
+func (wc *Watcher) IsRunning() bool {
+	return wc.isRunning
+}
diff --git a/src/common/utils/utils.go b/src/common/utils/utils.go
index ff1fcd2b1..5436e17b3 100644
--- a/src/common/utils/utils.go
+++ b/src/common/utils/utils.go
@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"net"
 	"net/url"
+	"reflect"
 	"strconv"
 	"strings"
 	"time"
@@ -127,6 +128,48 @@ func ParseTimeStamp(timestamp string) (*time.Time, error) {
 	return &t, nil
 }
 
+//ConvertMapToStruct is used to fill the specified struct with map.
+func ConvertMapToStruct(object interface{}, valuesInMap map[string]interface{}) error {
+	if object == nil {
+		return fmt.Errorf("nil struct is not supported")
+	}
+
+	if reflect.TypeOf(object).Kind() != reflect.Ptr {
+		return fmt.Errorf("object should be referred by pointer")
+	}
+
+	for k, v := range valuesInMap {
+		if err := setField(object, k, v); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func setField(object interface{}, field string, value interface{}) error {
+	structValue := reflect.ValueOf(object).Elem()
+
+	structFieldValue := structValue.FieldByName(field)
+	if !structFieldValue.IsValid() {
+		return fmt.Errorf("No such field: %s in obj", field)
+	}
+
+	if !structFieldValue.CanSet() {
+		return fmt.Errorf("Cannot set value for field %s", field)
+	}
+
+	structFieldType := structFieldValue.Type()
+	val := reflect.ValueOf(value)
+	if structFieldType != val.Type() {
+		return errors.New("Provided value type didn't match object field type")
+	}
+
+	structFieldValue.Set(val)
+
+	return nil
+}
+
 // ParseProjectIDOrName parses value to ID(int64) or name(string)
 func ParseProjectIDOrName(value interface{}) (int64, string, error) {
 	if value == nil {
diff --git a/src/common/utils/utils_test.go b/src/common/utils/utils_test.go
index fda1695b7..82b7b5e9e 100644
--- a/src/common/utils/utils_test.go
+++ b/src/common/utils/utils_test.go
@@ -243,3 +243,23 @@ func TestParseHarborIDOrName(t *testing.T) {
 	assert.Equal(t, int64(0), id)
 	assert.Equal(t, "project", name)
 }
+
+type testingStruct struct {
+	Name  string
+	Count int
+}
+
+func TestConvertMapToStruct(t *testing.T) {
+	dataMap := make(map[string]interface{})
+	dataMap["Name"] = "testing"
+	dataMap["Count"] = 100
+
+	obj := &testingStruct{}
+	if err := ConvertMapToStruct(obj, dataMap); err != nil {
+		t.Fatal(err)
+	} else {
+		if obj.Name != "testing" || obj.Count != 100 {
+			t.Fail()
+		}
+	}
+}
diff --git a/src/ui/api/config.go b/src/ui/api/config.go
index 7b5af6cce..e1854d702 100644
--- a/src/ui/api/config.go
+++ b/src/ui/api/config.go
@@ -190,6 +190,9 @@ func (c *ConfigAPI) Put() {
 		log.Errorf("failed to load configurations: %v", err)
 		c.CustomAbort(http.StatusInternalServerError, http.StatusText(http.StatusInternalServerError))
 	}
+
+	//Everything is ok, detect the configurations to confirm if the option we are caring is changed.
+	watchConfigChanges(cfg)
 }
 
 // Reset system configurations
diff --git a/src/ui/api/utils.go b/src/ui/api/utils.go
index 2fff9de26..0919c31c8 100644
--- a/src/ui/api/utils.go
+++ b/src/ui/api/utils.go
@@ -17,14 +17,17 @@ package api
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"net/http"
+	"reflect"
 	"sort"
 	"strings"
 
 	"github.com/vmware/harbor/src/common/dao"
 	"github.com/vmware/harbor/src/common/models"
+	"github.com/vmware/harbor/src/common/notifier"
 	"github.com/vmware/harbor/src/common/utils"
 	"github.com/vmware/harbor/src/common/utils/clair"
 	registry_error "github.com/vmware/harbor/src/common/utils/error"
@@ -496,3 +499,35 @@ func transformVulnerabilities(layerWithVuln *models.ClairLayerEnvelope) []*model
 	}
 	return res
 }
+
+//Watch the configuration changes.
+func watchConfigChanges(cfg map[string]interface{}) error {
+	if cfg == nil {
+		return errors.New("Empty configurations")
+	}
+
+	//Currently only watch the scan all policy change.
+	if v, ok := cfg[notifier.ScanAllPolicyTopic]; ok {
+		if reflect.TypeOf(v).Kind() == reflect.Map {
+			policyCfg := &models.ScanAllPolicy{}
+			if err := utils.ConvertMapToStruct(policyCfg, v.(map[string]interface{})); err != nil {
+				return err
+			}
+
+			policyNotification := notifier.ScanPolicyNotification{
+				Type:      policyCfg.Type,
+				DailyTime: 0,
+			}
+
+			if t, yes := policyCfg.Parm["daily_time"]; yes {
+				if reflect.TypeOf(t).Kind() == reflect.Int {
+					policyNotification.DailyTime = (int64)(t.(int))
+				}
+			}
+
+			return notifier.Publish(notifier.ScanAllPolicyTopic, policyNotification)
+		}
+	}
+
+	return nil
+}
diff --git a/src/ui/config/config.go b/src/ui/config/config.go
index e85cd69ff..785b0efba 100644
--- a/src/ui/config/config.go
+++ b/src/ui/config/config.go
@@ -143,7 +143,7 @@ func Reset() error {
 	return mg.Reset()
 }
 
-// Upload uploads all system configutations to admin server
+// Upload uploads all system configurations to admin server
 func Upload(cfg map[string]interface{}) error {
 	return mg.Upload(cfg)
 }
diff --git a/src/ui/main.go b/src/ui/main.go
index 5a3651912..7f7f57e47 100644
--- a/src/ui/main.go
+++ b/src/ui/main.go
@@ -17,6 +17,7 @@ package main
 import (
 	"fmt"
 	"os"
+	"reflect"
 
 	"github.com/vmware/harbor/src/common/utils"
 	"github.com/vmware/harbor/src/common/utils/log"
@@ -26,6 +27,8 @@ import (
 
 	"github.com/vmware/harbor/src/common/dao"
 	"github.com/vmware/harbor/src/common/models"
+	"github.com/vmware/harbor/src/common/notifier"
+	"github.com/vmware/harbor/src/common/scheduler"
 	"github.com/vmware/harbor/src/ui/api"
 	_ "github.com/vmware/harbor/src/ui/auth/db"
 	_ "github.com/vmware/harbor/src/ui/auth/ldap"
@@ -98,6 +101,26 @@ func main() {
 		log.Error(err)
 	}
 
+	//Enable the policy scheduler here.
+	scheduler.DefaultScheduler.Start()
+
+	//Subscribe the policy change topic.
+	notifier.Subscribe(notifier.ScanAllPolicyTopic, &notifier.ScanPolicyNotificationHandler{})
+
+	//Get policy configuration.
+	scanAllPolicy := config.ScanAllPolicy()
+	if scanAllPolicy.Type == notifier.PolicyTypeDaily {
+		dailyTime := 0
+		if t, ok := scanAllPolicy.Parm["daily_time"]; ok {
+			if reflect.TypeOf(t).Kind() == reflect.Int {
+				dailyTime = t.(int)
+			}
+		}
+
+		//Send notification to handle first policy change.
+		notifier.Publish(notifier.ScanAllPolicyTopic, notifier.ScanPolicyNotification{Type: scanAllPolicy.Type, DailyTime: (int64)(dailyTime)})
+	}
+
 	filter.Init()
 	beego.InsertFilter("/*", beego.BeforeRouter, filter.SecurityFilter)
 
diff --git a/src/ui_ng/lib/src/config/config.ts b/src/ui_ng/lib/src/config/config.ts
index a5672b35a..383e490f7 100644
--- a/src/ui_ng/lib/src/config/config.ts
+++ b/src/ui_ng/lib/src/config/config.ts
@@ -100,7 +100,7 @@ export class Configuration {
         this.verify_remote_cert = new BoolValueItem(false, true);
         this.scan_all_policy = new ComplexValueItem({
             type: "daily",
-            parameters: {
+            parameter: {
                 daily_time: 0
             }
         }, true);
diff --git a/src/ui_ng/lib/src/config/registry-config.component.html.ts b/src/ui_ng/lib/src/config/registry-config.component.html.ts
index 6402681bd..98c594fa8 100644
--- a/src/ui_ng/lib/src/config/registry-config.component.html.ts
+++ b/src/ui_ng/lib/src/config/registry-config.component.html.ts
@@ -1,7 +1,12 @@
 export const REGISTRY_CONFIG_HTML: string = `
 <div>
-    <replication-config [(replicationConfig)]="config"></replication-config>
-    <system-settings [(systemSettings)]="config"></system-settings>
-    <vulnerability-config [(vulnerabilityConfig)]="config"></vulnerability-config>
+    <replication-config #replicationConfig [(replicationConfig)]="config"></replication-config>
+    <system-settings #systemSettings [(systemSettings)]="config"></system-settings>
+    <vulnerability-config #vulnerabilityConfig [(vulnerabilityConfig)]="config"></vulnerability-config>
+    <div>
+        <button type="button" class="btn btn-primary" (click)="save()" [disabled]="shouldDisable">{{'BUTTON.SAVE' | translate}}</button>
+        <button type="button" class="btn btn-outline" (click)="cancel()" [disabled]="shouldDisable">{{'BUTTON.CANCEL' | translate}}</button>
+    </div>
+    <confirmation-dialog #cfgConfirmationDialog (confirmAction)="confirmCancel($event)"></confirmation-dialog>
 </div>
 `;
\ No newline at end of file
diff --git a/src/ui_ng/lib/src/config/registry-config.component.spec.ts b/src/ui_ng/lib/src/config/registry-config.component.spec.ts
index ed1a2894e..65dfc83a3 100644
--- a/src/ui_ng/lib/src/config/registry-config.component.spec.ts
+++ b/src/ui_ng/lib/src/config/registry-config.component.spec.ts
@@ -8,6 +8,7 @@ import { ReplicationConfigComponent } from './replication/replication-config.com
 import { SystemSettingsComponent } from './system/system-settings.component';
 import { VulnerabilityConfigComponent } from './vulnerability/vulnerability-config.component';
 import { RegistryConfigComponent } from './registry-config.component';
+import { ConfirmationDialogComponent } from '../confirmation-dialog/confirmation-dialog.component';
 
 import { 
   ConfigurationService, 
@@ -29,7 +30,7 @@ describe('RegistryConfigComponent (inline template)', () => {
   mockConfig.verify_remote_cert.value = true;
   mockConfig.scan_all_policy.value = {
     type: "daily",
-    parameters: {
+    parameter: {
       daily_time: 0
     }
   };
@@ -46,7 +47,8 @@ describe('RegistryConfigComponent (inline template)', () => {
         ReplicationConfigComponent,
         SystemSettingsComponent,
         VulnerabilityConfigComponent,
-        RegistryConfigComponent
+        RegistryConfigComponent,
+        ConfirmationDialogComponent
       ],
       providers: [
         ErrorHandler,
diff --git a/src/ui_ng/lib/src/config/registry-config.component.ts b/src/ui_ng/lib/src/config/registry-config.component.ts
index f3b21a94c..49c61fbd4 100644
--- a/src/ui_ng/lib/src/config/registry-config.component.ts
+++ b/src/ui_ng/lib/src/config/registry-config.component.ts
@@ -1,10 +1,22 @@
-import { Component, OnInit, EventEmitter, Output } from '@angular/core';
+import { Component, OnInit, EventEmitter, Output, ViewChild } from '@angular/core';
 
 import { Configuration, ComplexValueItem } from './config';
 import { REGISTRY_CONFIG_HTML } from './registry-config.component.html';
 import { ConfigurationService } from '../service/index';
 import { toPromise } from '../utils';
 import { ErrorHandler } from '../error-handler';
+import {
+    ReplicationConfigComponent,
+    SystemSettingsComponent,
+    VulnerabilityConfigComponent
+} from './index';
+
+import { ConfirmationState, ConfirmationTargets, ConfirmationButtons } from '../shared/shared.const';
+import { ConfirmationDialogComponent } from '../confirmation-dialog/confirmation-dialog.component';
+import { ConfirmationMessage } from '../confirmation-dialog/confirmation-message';
+import { ConfirmationAcknowledgement } from '../confirmation-dialog/confirmation-state-message';
+import { TranslateService } from '@ngx-translate/core';
+
 
 @Component({
     selector: 'hbr-registry-config',
@@ -13,27 +25,56 @@ import { ErrorHandler } from '../error-handler';
 export class RegistryConfigComponent implements OnInit {
     config: Configuration = new Configuration();
     configCopy: Configuration;
+    onGoing: boolean = false;
 
-    @Output() configChanged: EventEmitter<any> = new EventEmitter<any>();
+    @ViewChild("replicationConfig") replicationCfg: ReplicationConfigComponent;
+    @ViewChild("systemSettings") systemSettings: SystemSettingsComponent;
+    @ViewChild("vulnerabilityConfig") vulnerabilityCfg: VulnerabilityConfigComponent;
+    @ViewChild("cfgConfirmationDialog") confirmationDlg: ConfirmationDialogComponent;
 
     constructor(
         private configService: ConfigurationService,
-        private errorHandler: ErrorHandler
+        private errorHandler: ErrorHandler,
+        private translate: TranslateService
     ) { }
 
+    get shouldDisable(): boolean {
+        return !this.isValid() || !this.hasChanges() || this.onGoing;
+    }
+
     ngOnInit(): void {
         //Initialize
         this.load();
     }
 
+    isValid(): boolean {
+        return this.replicationCfg &&
+            this.replicationCfg.isValid &&
+            this.systemSettings &&
+            this.systemSettings.isValid &&
+            this.vulnerabilityCfg &&
+            this.vulnerabilityCfg.isValid;
+    }
+
+    hasChanges(): boolean {
+        return !this._isEmptyObject(this.getChanges());
+    }
+
     //Load configurations
     load(): void {
+        this.onGoing = true;
         toPromise<Configuration>(this.configService.getConfigurations())
             .then((config: Configuration) => {
-                this.configCopy = Object.assign({}, config);
+                this.onGoing = false;
+
+                this.configCopy = this._clone(config);
                 this.config = config;
             })
-            .catch(error => this.errorHandler.error(error));
+            .catch(error => {
+                this.onGoing = false;
+
+                this.errorHandler.error(error);
+            });
     }
 
     //Save configuration changes
@@ -45,26 +86,48 @@ export class RegistryConfigComponent implements OnInit {
             return;
         }
 
-        //Fix policy parameters issue
-        let scanningAllPolicy = changes["scan_all_policy"];
-        if (scanningAllPolicy &&
-            scanningAllPolicy.type !== "daily" &&
-            scanningAllPolicy.parameters) {
-            delete (scanningAllPolicy.parameters);
-        }
-
+        this.onGoing = true;
         toPromise<any>(this.configService.saveConfigurations(changes))
             .then(() => {
-                this.configChanged.emit(changes);
+                this.onGoing = false;
+
+                this.translate.get("CONFIG.SAVE_SUCCESS").subscribe((res: string) => {
+                    this.errorHandler.info(res);
+                });
+                //Reload to fetch all the updates
+                this.load();
             })
-            .catch(error => this.errorHandler.error(error));
+            .catch(error => {
+                this.onGoing = false;
+                this.errorHandler.error(error);
+            });
+    }
+
+    //Cancel the changes if have
+    cancel(): void {
+        let msg = new ConfirmationMessage(
+            "CONFIG.CONFIRM_TITLE",
+            "CONFIG.CONFIRM_SUMMARY",
+            "",
+            {},
+            ConfirmationTargets.CONFIG
+        );
+        this.confirmationDlg.open(msg);
+    }
+
+    //Confirm cancel
+    confirmCancel(ack: ConfirmationAcknowledgement): void {
+        if (ack && ack.source === ConfirmationTargets.CONFIG &&
+            ack.state === ConfirmationState.CONFIRMED) {
+            this.reset();
+        }
     }
 
     reset(): void {
         //Reset to the values of copy
         let changes: { [key: string]: any | any[] } = this.getChanges();
         for (let prop in changes) {
-            this.config[prop] = Object.assign({}, this.configCopy[prop]);
+            this.config[prop] = this._clone(this.configCopy[prop]);
         }
     }
 
@@ -107,4 +170,10 @@ export class RegistryConfigComponent implements OnInit {
     _isEmptyObject(obj: any): boolean {
         return !obj || JSON.stringify(obj) === "{}";
     }
+
+    //Deeper clone all
+    _clone(srcObj: any): any {
+        if (!srcObj) return null;
+        return JSON.parse(JSON.stringify(srcObj));
+    }
 }
\ No newline at end of file
diff --git a/src/ui_ng/lib/src/config/vulnerability/vulnerability-config.component.template.ts b/src/ui_ng/lib/src/config/vulnerability/vulnerability-config.component.template.ts
index 67c0fc373..361f4cb1b 100644
--- a/src/ui_ng/lib/src/config/vulnerability/vulnerability-config.component.template.ts
+++ b/src/ui_ng/lib/src/config/vulnerability/vulnerability-config.component.template.ts
@@ -5,7 +5,7 @@ export const VULNERABILITY_CONFIG_HTML: string = `
         <div class="form-group">
             <label for="scanAllPolicy">{{ 'CONFIG.SCANNING.SCAN_ALL' | translate }}</label>
             <div class="select">
-                <select id="scanAllPolicy" name="scanAllPolicy" [disabled]="!editable" [(ngModel)]="vulnerabilityConfig.scan_all_policy.value.type">
+                <select id="scanAllPolicy" name="scanAllPolicy" [disabled]="!editable" [(ngModel)]="scanningType">
                     <option value="none">{{ 'CONFIG.SCANNING.NONE_POLICY' | translate }}</option>
                     <option value="daily">{{ 'CONFIG.SCANNING.DAILY_POLICY' | translate }}</option>
                     <option value="on_refresh">{{ 'CONFIG.SCANNING.REFRESH_POLICY' | translate }}</option>
diff --git a/src/ui_ng/lib/src/config/vulnerability/vulnerability-config.component.ts b/src/ui_ng/lib/src/config/vulnerability/vulnerability-config.component.ts
index ee57b9894..b8cceb360 100644
--- a/src/ui_ng/lib/src/config/vulnerability/vulnerability-config.component.ts
+++ b/src/ui_ng/lib/src/config/vulnerability/vulnerability-config.component.ts
@@ -30,13 +30,13 @@ export class VulnerabilityConfigComponent {
         this.config = cfg;
         if (this.config.scan_all_policy &&
             this.config.scan_all_policy.value) {
-                if (this.config.scan_all_policy.value.type === "daily"){
-                    if(!this.config.scan_all_policy.value.parameters){
-                        this.config.scan_all_policy.value.parameters = {
-                            daily_time: 0
-                        };
-                    }
+            if (this.config.scan_all_policy.value.type === "daily") {
+                if (!this.config.scan_all_policy.value.parameter) {
+                    this.config.scan_all_policy.value.parameter = {
+                        daily_time: 0
+                    };
                 }
+            }
         }
         this.configChange.emit(this.config);
     }
@@ -51,8 +51,8 @@ export class VulnerabilityConfigComponent {
         }
 
         let timeOffset: number = 0;//seconds
-        if (this.config.scan_all_policy.value.parameters) {
-            let daily_time = this.config.scan_all_policy.value.parameters.daily_time;
+        if (this.config.scan_all_policy.value.parameter) {
+            let daily_time = this.config.scan_all_policy.value.parameter.daily_time;
             if (daily_time && typeof daily_time === "number") {
                 timeOffset = +daily_time;
             }
@@ -99,8 +99,9 @@ export class VulnerabilityConfigComponent {
             return;
         }
 
-        if (!this.config.scan_all_policy.value.parameters) {
-            this.config.scan_all_policy.value.parameters = {
+        //Double confirm inner parameter existing.
+        if (!this.config.scan_all_policy.value.parameter) {
+            this.config.scan_all_policy.value.parameter = {
                 daily_time: 0
             };
         }
@@ -124,7 +125,41 @@ export class VulnerabilityConfigComponent {
             utcTimes -= ONE_DAY_SECONDS;
         }
 
-        this.config.scan_all_policy.value.parameters.daily_time = utcTimes;
+        this.config.scan_all_policy.value.parameter.daily_time = utcTimes;
+    }
+
+    //Scanning type
+    get scanningType(): string {
+        if (this.config &&
+            this.config.scan_all_policy &&
+            this.config.scan_all_policy.value) {
+            return this.config.scan_all_policy.value.type;
+        } else {
+            //default
+            return "none";
+        }
+    }
+
+    set scanningType(v: string) {
+        if (this.config &&
+            this.config.scan_all_policy &&
+            this.config.scan_all_policy.value) {
+            let type: string = (v && v.trim() !== "") ? v : "none";
+            this.config.scan_all_policy.value.type = type;
+            if (type !== "daily") {
+                //No parameter
+                if (this.config.scan_all_policy.value.parameter) {
+                    delete (this.config.scan_all_policy.value.parameter);
+                }
+            } else {
+                //Has parameter
+                if (!this.config.scan_all_policy.value.parameter) {
+                    this.config.scan_all_policy.value.parameter = {
+                        daily_time: 0
+                    };
+                }
+            }
+        }
     }
 
     @ViewChild("systemConfigFrom") systemSettingsForm: NgForm;
diff --git a/src/ui_ng/package.json b/src/ui_ng/package.json
index 190f33685..56b3f804d 100644
--- a/src/ui_ng/package.json
+++ b/src/ui_ng/package.json
@@ -31,7 +31,7 @@
         "clarity-icons": "^0.9.8",
         "clarity-ui": "^0.9.8",
         "core-js": "^2.4.1",
-        "harbor-ui": "^0.2.40",
+        "harbor-ui": "^0.2.52",
         "intl": "^1.2.5",
         "mutationobserver-shim": "^0.3.2",
         "ngx-cookie": "^1.0.0",
diff --git a/src/ui_ng/src/app/config/config.component.html b/src/ui_ng/src/app/config/config.component.html
index 060a4b21e..b5b19707f 100644
--- a/src/ui_ng/src/app/config/config.component.html
+++ b/src/ui_ng/src/app/config/config.component.html
@@ -16,7 +16,7 @@
                 <button id="config-system" class="btn btn-link nav-link" aria-controls="system_settings" [class.active]='isCurrentTabLink("config-system")' type="button" (click)='tabLinkClick("config-system")'>{{'CONFIG.SYSTEM' | translate }}</button>
             </li>
             <li role="presentation" class="nav-item">
-                <button id="config-vulnerability" class="btn btn-link nav-link" aria-controls="vulnerability" [class.active]='isCurrentTabLink("config-vulnerability")' type="button" (click)='tabLinkClick("config-vulnerability")'>Vulnerability</button>
+                <button id="config-vulnerability" class="btn btn-link nav-link" aria-controls="vulnerability" [class.active]='isCurrentTabLink("config-vulnerability")' type="button" (click)='tabLinkClick("config-vulnerability")'>{{'VULNERABILITY.SINGULAR' | translate}}</button>
             </li>
         </ul>
         <section id="authentication" role="tabpanel" aria-labelledby="config-auth" [hidden]='!isCurrentTabContent("authentication")'>
@@ -41,7 +41,6 @@
             <button type="button" class="btn btn-outline" (click)="testLDAPServer()" *ngIf="showLdapServerBtn" [disabled]="!isLDAPConfigValid()">{{'BUTTON.TEST_LDAP' | translate}}</button>
             <span id="forTestingMail" class="spinner spinner-inline" [hidden]="hideMailTestingSpinner"></span>
             <span id="forTestingLDAP" class="spinner spinner-inline" [hidden]="hideLDAPTestingSpinner"></span>
-            <button type="button" class="btn btn-primary" (click)="consoleTest()">CONSOLE</button>
         </div>
     </div>
 </div>
\ No newline at end of file
diff --git a/src/ui_ng/src/app/config/config.component.ts b/src/ui_ng/src/app/config/config.component.ts
index b99734116..f239e8d45 100644
--- a/src/ui_ng/src/app/config/config.component.ts
+++ b/src/ui_ng/src/app/config/config.component.ts
@@ -71,11 +71,6 @@ export class ConfigurationComponent implements OnInit, OnDestroy {
         private appConfigService: AppConfigService,
         private session: SessionService) { }
 
-    consoleTest(): void {
-        console.log(this.allConfig, this.originalCopy);
-        console.log("-------------");
-        console.log(this.getChanges());
-    }
     isCurrentTabLink(tabId: string): boolean {
         return this.currentTabId === tabId;
     }