diff --git a/src/controller/p2p/preheat/controller.go b/src/controller/p2p/preheat/controller.go
index acd752c63..bad90f5dd 100644
--- a/src/controller/p2p/preheat/controller.go
+++ b/src/controller/p2p/preheat/controller.go
@@ -117,6 +117,8 @@ type Controller interface {
 	ListPoliciesByProject(ctx context.Context, project int64, query *q.Query) ([]*policyModels.Schema, error)
 	// CheckHealth checks the instance health, for test connection
 	CheckHealth(ctx context.Context, instance *providerModels.Instance) error
+	// DeletePoliciesOfProject delete all policies under one project
+	DeletePoliciesOfProject(ctx context.Context, project int64) error
 }
 
 var _ Controller = (*controller)(nil)
@@ -419,6 +421,21 @@ func (c *controller) DeletePolicy(ctx context.Context, id int64) error {
 	return c.pManager.Delete(ctx, id)
 }
 
+// DeletePoliciesOfProject deletes all the policy under project.
+func (c *controller) DeletePoliciesOfProject(ctx context.Context, project int64) error {
+	policies, err := c.ListPoliciesByProject(ctx, project, nil)
+	if err != nil {
+		return err
+	}
+
+	for _, p := range policies {
+		if err = c.DeletePolicy(ctx, p.ID); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 // deleteExecs delete executions
 func (c *controller) deleteExecs(ctx context.Context, vendorID int64) error {
 	executions, err := c.executionMgr.List(ctx, &q.Query{
diff --git a/src/controller/p2p/preheat/controllor_test.go b/src/controller/p2p/preheat/controllor_test.go
index e1c290822..a9649c909 100644
--- a/src/controller/p2p/preheat/controllor_test.go
+++ b/src/controller/p2p/preheat/controllor_test.go
@@ -335,6 +335,22 @@ func (s *preheatSuite) TestListPoliciesByProject() {
 	s.NotNil(p)
 }
 
+func (s *preheatSuite) TestDeletePoliciesOfProject() {
+	fakePolicies := []*policy.Schema{
+		{ID: 1000, Name: "1-should-delete", ProjectID: 10},
+		{ID: 1001, Name: "2-should-delete", ProjectID: 10},
+	}
+	s.fakePolicyMgr.On("ListPoliciesByProject", s.ctx, int64(10), mock.Anything).Return(fakePolicies, nil)
+	for _, p := range fakePolicies {
+		s.fakePolicyMgr.On("Get", s.ctx, p.ID).Return(p, nil)
+		s.fakePolicyMgr.On("Delete", s.ctx, p.ID).Return(nil)
+		s.fakeExecutionMgr.On("List", s.ctx, &q.Query{Keywords: map[string]interface{}{"VendorID": p.ID, "VendorType": "P2P_PREHEAT"}}).Return([]*taskModel.Execution{}, nil)
+	}
+
+	err := s.controller.DeletePoliciesOfProject(s.ctx, 10)
+	s.NoError(err)
+}
+
 func (s *preheatSuite) TestCheckHealth() {
 	// if instance is nil
 	var instance *providerModel.Instance
diff --git a/src/server/v2.0/handler/project.go b/src/server/v2.0/handler/project.go
index c8c1dc258..43e54b849 100644
--- a/src/server/v2.0/handler/project.go
+++ b/src/server/v2.0/handler/project.go
@@ -3,7 +3,6 @@ package handler
 import (
 	"context"
 	"fmt"
-	"github.com/goharbor/harbor/src/pkg/robot"
 	"strconv"
 	"strings"
 	"sync"
@@ -15,6 +14,7 @@ import (
 	"github.com/goharbor/harbor/src/common/rbac"
 	"github.com/goharbor/harbor/src/common/security"
 	"github.com/goharbor/harbor/src/common/security/local"
+	"github.com/goharbor/harbor/src/controller/p2p/preheat"
 	"github.com/goharbor/harbor/src/controller/project"
 	"github.com/goharbor/harbor/src/controller/quota"
 	"github.com/goharbor/harbor/src/controller/repository"
@@ -29,6 +29,7 @@ import (
 	"github.com/goharbor/harbor/src/pkg/project/metadata"
 	"github.com/goharbor/harbor/src/pkg/quota/types"
 	"github.com/goharbor/harbor/src/pkg/retention/policy"
+	"github.com/goharbor/harbor/src/pkg/robot"
 	"github.com/goharbor/harbor/src/pkg/user"
 	"github.com/goharbor/harbor/src/replication"
 	"github.com/goharbor/harbor/src/server/v2.0/handler/model"
@@ -48,6 +49,7 @@ func newProjectAPI() *projectAPI {
 		projectCtl:    project.Ctl,
 		quotaCtl:      quota.Ctl,
 		robotMgr:      robot.Mgr,
+		preheatCtl:    preheat.Ctl,
 	}
 }
 
@@ -60,6 +62,7 @@ type projectAPI struct {
 	projectCtl    project.Controller
 	quotaCtl      quota.Controller
 	robotMgr      robot.Manager
+	preheatCtl    preheat.Controller
 }
 
 func (a *projectAPI) CreateProject(ctx context.Context, params operation.CreateProjectParams) middleware.Responder {
@@ -212,6 +215,11 @@ func (a *projectAPI) DeleteProject(ctx context.Context, params operation.DeleteP
 		}
 	}
 
+	// preheat policies under the project should be deleted after deleting the project
+	if err = a.preheatCtl.DeletePoliciesOfProject(ctx, params.ProjectID); err != nil {
+		return a.SendError(ctx, err)
+	}
+
 	return operation.NewDeleteProjectOK()
 }