diff --git a/pkg/apiserver/event/sync/convert.go b/pkg/apiserver/event/sync/convert.go
index 47cbdb27b..b921c2deb 100644
--- a/pkg/apiserver/event/sync/convert.go
+++ b/pkg/apiserver/event/sync/convert.go
@@ -190,7 +190,7 @@ func (c *CR2UX) generateEnv(ctx context.Context, defaultProject string, envNames
 				env.Targets = append(env.Targets, name)
 			}
 		}
-		return env, "", nil
+		return env, env.Project, nil
 	}
 
 	// generate new environment
diff --git a/pkg/apiserver/event/sync/cr2ux_test.go b/pkg/apiserver/event/sync/cr2ux_test.go
index c2e8365ca..a0b0c8804 100644
--- a/pkg/apiserver/event/sync/cr2ux_test.go
+++ b/pkg/apiserver/event/sync/cr2ux_test.go
@@ -217,6 +217,47 @@ var _ = Describe("Test CR convert to ux", func() {
 		Expect(count).Should(Equal(int64(2)))
 	})
 
+	It("Test to sync the project which existed env belongs", func() {
+		dbNamespace := "update-app-db-ns1-test"
+		ds, err := NewDatastore(datastore.Config{Type: "kubeapi", Database: dbNamespace})
+		Expect(err).Should(BeNil())
+
+		cr2ux := newCR2UX(ds)
+
+		projectName := "project-test"
+
+		_, err = cr2ux.projectService.CreateProject(context.TODO(), v1.CreateProjectRequest{
+			Name:  projectName,
+			Owner: "admin",
+		})
+		Expect(err).Should(BeNil())
+
+		_, err = cr2ux.targetService.CreateTarget(context.TODO(), v1.CreateTargetRequest{
+			Name:    "target-test1",
+			Project: projectName,
+			Cluster: &v1.ClusterTarget{
+				ClusterName: "local",
+				Namespace:   "target-test1",
+			},
+		})
+		Expect(err).Should(BeNil())
+		_, err = cr2ux.envService.CreateEnv(context.TODO(), v1.CreateEnvRequest{
+			Name:      "env-test1",
+			Project:   projectName,
+			Namespace: "env-test1",
+			Targets:   []string{"target-test1"},
+		})
+		Expect(err).Should(BeNil())
+
+		app5 := &v1beta1.Application{}
+		Expect(common2.ReadYamlToObject("testdata/test-app5.yaml", app5)).Should(BeNil())
+		app5.Namespace = "env-test1"
+		Expect(cr2ux.AddOrUpdate(context.Background(), app5)).Should(BeNil())
+
+		app, err := cr2ux.applicationService.GetApplication(context.TODO(), app5.Name)
+		Expect(err).Should(BeNil())
+		Expect(app.Project).Should(Equal("project-test"))
+	})
 })
 
 func newCR2UX(ds datastore.DataStore) *CR2UX {
diff --git a/pkg/apiserver/event/sync/testdata/test-app5.yaml b/pkg/apiserver/event/sync/testdata/test-app5.yaml
new file mode 100644
index 000000000..0fc7b94f8
--- /dev/null
+++ b/pkg/apiserver/event/sync/testdata/test-app5.yaml
@@ -0,0 +1,16 @@
+apiVersion: core.oam.dev/v1beta1
+kind: Application
+metadata:
+  name: example-sync-project
+spec:
+  components:
+    - name: example-exist-env
+      type: webservice
+      properties:
+        image: wordpress
+      traits:
+        - type: gateway
+          properties:
+            domain: testsvc.example.com
+            http:
+              "/": 8000
\ No newline at end of file