diff --git a/pkg/controllers/execution/execution_controller.go b/pkg/controllers/execution/execution_controller.go
index 78b85ec3f..8d0d373ac 100644
--- a/pkg/controllers/execution/execution_controller.go
+++ b/pkg/controllers/execution/execution_controller.go
@@ -26,9 +26,8 @@ import (
 
 const (
 	// ControllerName is the controller name that will be used when reporting events.
-	ControllerName  = "execution-controller"
-	finalizer       = "karmada.io/execution-controller"
-	memberClusterNS = "karmada-cluster"
+	ControllerName = "execution-controller"
+	finalizer      = "karmada.io/execution-controller"
 )
 
 // Controller is to sync PropagationWork.
@@ -127,7 +126,7 @@ func (c *Controller) deletePropagationWork(propagationWork *propagationstrategy.
 	}
 
 	// TODO(RainbowMango): retrieve member cluster from the local cache instead of a real request to API server.
-	memberCluster, err := c.KarmadaClient.MemberclusterV1alpha1().MemberClusters(memberClusterNS).Get(context.TODO(), executionSpace, v1.GetOptions{})
+	memberCluster, err := c.KarmadaClient.MemberclusterV1alpha1().MemberClusters().Get(context.TODO(), executionSpace, v1.GetOptions{})
 	if err != nil {
 		klog.Errorf("Failed to get status of the given member cluster %s", executionSpace)
 		return err
@@ -169,7 +168,7 @@ func (c *Controller) dispatchPropagationWork(propagationWork *propagationstrateg
 	}
 
 	// TODO(RainbowMango): retrieve member cluster from the local cache instead of a real request to API server.
-	memberCluster, err := c.KarmadaClient.MemberclusterV1alpha1().MemberClusters(memberClusterNS).Get(context.TODO(), executionSpace, v1.GetOptions{})
+	memberCluster, err := c.KarmadaClient.MemberclusterV1alpha1().MemberClusters().Get(context.TODO(), executionSpace, v1.GetOptions{})
 	if err != nil {
 		klog.Errorf("Failed to get status of the given member cluster %s", executionSpace)
 		return err
diff --git a/pkg/controllers/membercluster/membercluster_controller.go b/pkg/controllers/membercluster/membercluster_controller.go
index 2902ea830..88a091025 100644
--- a/pkg/controllers/membercluster/membercluster_controller.go
+++ b/pkg/controllers/membercluster/membercluster_controller.go
@@ -40,7 +40,7 @@ type Controller struct {
 // The Controller will requeue the Request to be processed again if an error is non-nil or
 // Result.Requeue is true, otherwise upon completion it will remove the work from the queue.
 func (c *Controller) Reconcile(req controllerruntime.Request) (controllerruntime.Result, error) {
-	klog.V(4).Infof("Reconciling memberCluster %s", req.NamespacedName.String())
+	klog.V(4).Infof("Reconciling memberCluster %s", req.NamespacedName.Name)
 
 	memberCluster := &v1alpha1.MemberCluster{}
 	if err := c.Client.Get(context.TODO(), req.NamespacedName, memberCluster); err != nil {
diff --git a/pkg/karmadactl/join.go b/pkg/karmadactl/join.go
index d5a334dcd..d0ae55862 100644
--- a/pkg/karmadactl/join.go
+++ b/pkg/karmadactl/join.go
@@ -229,7 +229,6 @@ func Run(cmdOut io.Writer, karmadaConfig KarmadaConfig, opts CommandJoinOption)
 	}
 
 	memberClusterObj := &memberclusterapi.MemberCluster{}
-	memberClusterObj.Namespace = opts.ClusterNamespace
 	memberClusterObj.Name = opts.MemberClusterName
 	memberClusterObj.Spec.APIEndpoint = memberClusterConfig.Host
 	memberClusterObj.Spec.SecretRef = &memberclusterapi.LocalSecretReference{
@@ -380,7 +379,7 @@ func createMemberClusterObject(controlPlaneClient *karmadaclientset.Clientset, m
 
 // IsMemberClusterExist tells if a member cluster (namespace/name) already joined to control plane.
 func IsMemberClusterExist(controlPlaneClient karmadaclientset.Interface, namespace string, name string) (bool, error) {
-	_, err := controlPlaneClient.MemberclusterV1alpha1().MemberClusters(namespace).Get(context.TODO(), name, metav1.GetOptions{})
+	_, err := controlPlaneClient.MemberclusterV1alpha1().MemberClusters().Get(context.TODO(), name, metav1.GetOptions{})
 	if err != nil {
 		if apierrors.IsNotFound(err) {
 			return false, nil
@@ -395,7 +394,7 @@ func IsMemberClusterExist(controlPlaneClient karmadaclientset.Interface, namespa
 
 // CreateMemberCluster creates a new member cluster object in control plane.
 func CreateMemberCluster(controlPlaneClient karmadaclientset.Interface, cluster *memberclusterapi.MemberCluster) error {
-	_, err := controlPlaneClient.MemberclusterV1alpha1().MemberClusters(cluster.Namespace).Create(context.TODO(), cluster, metav1.CreateOptions{})
+	_, err := controlPlaneClient.MemberclusterV1alpha1().MemberClusters().Create(context.TODO(), cluster, metav1.CreateOptions{})
 	if err != nil {
 		klog.Warningf("failed to create member cluster. member cluster: %s/%s, error: %v", cluster.Namespace, cluster.Name, err)
 		return err