diff --git a/pkg/search/proxy/store/multi_cluster_cache.go b/pkg/search/proxy/store/multi_cluster_cache.go
index 292abc978..ef97ae906 100644
--- a/pkg/search/proxy/store/multi_cluster_cache.go
+++ b/pkg/search/proxy/store/multi_cluster_cache.go
@@ -315,7 +315,6 @@ func (c *MultiClusterCache) Watch(ctx context.Context, gvr schema.GroupVersionRe
 		}
 
 		mux.AddSource(w, func(e watch.Event) {
-			// We can safely modify data because it is deepCopied in cacheWatcher.convertToWatchEvent
 			setObjectResourceVersionFunc(cluster, e.Object)
 			addCacheSourceAnnotation(e.Object, cluster)
 		})
diff --git a/pkg/search/proxy/store/util.go b/pkg/search/proxy/store/util.go
index d52d7fb0f..0333557a6 100644
--- a/pkg/search/proxy/store/util.go
+++ b/pkg/search/proxy/store/util.go
@@ -214,15 +214,16 @@ func (w *watchMux) startWatchSource(source watch.Interface, decorator func(watch
 	defer source.Stop()
 	defer w.Stop()
 	for {
-		var event watch.Event
-		var ok bool
+		var copyEvent watch.Event
 		select {
-		case event, ok = <-source.ResultChan():
+		case sourceEvent, ok := <-source.ResultChan():
 			if !ok {
 				return
 			}
+			// sourceEvent object is cacheObject,all watcher use the same point,must deepcopy.
+			copyEvent = *sourceEvent.DeepCopy()
 			if decorator != nil {
-				decorator(event)
+				decorator(copyEvent)
 			}
 		case <-w.done:
 			return
@@ -241,7 +242,7 @@ func (w *watchMux) startWatchSource(source watch.Interface, decorator func(watch
 			case <-w.done:
 				return
 			default:
-				w.result <- event
+				w.result <- copyEvent
 			}
 		}()
 	}