diff --git a/api/replication_job.go b/api/replication_job.go
index fd9da76cc..380018c7c 100644
--- a/api/replication_job.go
+++ b/api/replication_job.go
@@ -117,11 +117,8 @@ func (ra *RepJobAPI) GetLog() {
 	}
 
 	if resp.StatusCode == http.StatusOK {
-		for key, values := range resp.Header {
-			for _, value := range values {
-				ra.Ctx.ResponseWriter.Header().Set(key, value)
-			}
-		}
+		ra.Ctx.ResponseWriter.Header().Set(http.CanonicalHeaderKey("Content-Length"), resp.Header.Get(http.CanonicalHeaderKey("Content-Length")))
+		ra.Ctx.ResponseWriter.Header().Set(http.CanonicalHeaderKey("Content-Type"), "text/plain")
 
 		if _, err = io.Copy(ra.Ctx.ResponseWriter, resp.Body); err != nil {
 			log.Errorf("failed to write log to response; %v", err)
diff --git a/dao/replication_job.go b/dao/replication_job.go
index f77ce2b9f..6de5af82d 100644
--- a/dao/replication_job.go
+++ b/dao/replication_job.go
@@ -17,6 +17,7 @@ package dao
 
 import (
 	"fmt"
+	"time"
 
 	"strings"
 
@@ -253,8 +254,16 @@ func UpdateRepPolicyEnablement(id int64, enabled int) error {
 	o := GetOrmer()
 	p := models.RepPolicy{
 		ID:      id,
-		Enabled: enabled}
-	_, err := o.Update(&p, "Enabled")
+		Enabled: enabled,
+	}
+
+	var err error
+	if enabled == 1 {
+		p.StartTime = time.Now()
+		_, err = o.Update(&p, "Enabled", "StartTime")
+	} else {
+		_, err = o.Update(&p, "Enabled")
+	}
 
 	return err
 }
@@ -315,7 +324,7 @@ func FilterRepJobs(policyID int64, repository, status string) ([]*models.RepJob,
 	if len(status) != 0 {
 		qs = qs.Filter("Status__icontains", status)
 	}
-	qs = qs.OrderBy("CreationTime")
+	qs = qs.OrderBy("-CreationTime")
 
 	var jobs []*models.RepJob
 	_, err := qs.All(&jobs)
diff --git a/job/replication/transfer.go b/job/replication/transfer.go
index dd2fba546..1df309f72 100644
--- a/job/replication/transfer.go
+++ b/job/replication/transfer.go
@@ -68,6 +68,7 @@ type BaseHandler struct {
 	dstClient *registry.Repository
 
 	manifest distribution.Manifest // manifest of tags[0]
+	digest   string                //digest of tags[0]'s manifest
 	blobs    []string              // blobs need to be transferred for tags[0]
 
 	blobsExistence map[string]bool //key: digest of blob, value: existence
@@ -329,6 +330,7 @@ func (m *ManifestPuller) Enter() (string, error) {
 		m.logger.Errorf("an error occurred while pulling manifest of %s:%s from %s: %v", name, tag, m.srcURL, err)
 		return "", err
 	}
+	m.digest = digest
 	m.logger.Infof("manifest of %s:%s pulled successfully from %s: %s", name, tag, m.srcURL, digest)
 
 	if strings.Contains(mediaType, "application/json") {
@@ -426,6 +428,19 @@ func (m *ManifestPusher) Enter() (string, error) {
 		m.logger.Infof("manifest of %s:%s does not exist on source registry %s, cancel manifest pushing", name, tag, m.srcURL)
 	} else {
 		m.logger.Infof("manifest of %s:%s exists on source registry %s, continue manifest pushing", name, tag, m.srcURL)
+
+		_, manifestExist, err := m.dstClient.ManifestExist(m.digest)
+		if manifestExist {
+			m.logger.Infof("manifest of %s:%s exists on destination registry %s, skip manifest pushing", name, tag, m.dstURL)
+
+			m.tags = m.tags[1:]
+			m.manifest = nil
+			m.digest = ""
+			m.blobs = nil
+
+			return StatePullManifest, nil
+		}
+
 		mediaType, data, err := m.manifest.Payload()
 		if err != nil {
 			m.logger.Errorf("an error occurred while getting payload of manifest for %s:%s : %v", name, tag, err)
@@ -441,6 +456,7 @@ func (m *ManifestPusher) Enter() (string, error) {
 
 	m.tags = m.tags[1:]
 	m.manifest = nil
+	m.digest = ""
 	m.blobs = nil
 
 	return StatePullManifest, nil