diff --git a/designer-base/src/main/java/com/fr/design/notification/NotificationCenter.java b/designer-base/src/main/java/com/fr/design/notification/NotificationCenter.java
index 17b805ab61..3faadf795a 100644
--- a/designer-base/src/main/java/com/fr/design/notification/NotificationCenter.java
+++ b/designer-base/src/main/java/com/fr/design/notification/NotificationCenter.java
@@ -3,14 +3,13 @@ package com.fr.design.notification;
 
 import com.fr.design.notification.ui.NotificationCenterPane;
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.List;
 
 public class NotificationCenter {
     private static NotificationCenter notificationCenter = new NotificationCenter();
     private List<Notification> notifications;
     private NotificationCenter(){
-        notifications = Collections.synchronizedList(new ArrayList<>());
+        notifications = new ArrayList<>();
     }
 
     public static NotificationCenter getInstance(){
@@ -18,10 +17,8 @@ public class NotificationCenter {
     }
 
     public void addNotification(Notification message){
-        synchronized (this) {
-            notifications.add(message);
-            NotificationCenterPane.getNotificationCenterPane().refreshButton();
-        }
+        notifications.add(message);
+        NotificationCenterPane.getNotificationCenterPane().refreshButton();
     }
 
     public int getNotificationsCount(){
@@ -29,10 +26,8 @@ public class NotificationCenter {
     }
 
     public void removeNotification(int index){
-        synchronized (this) {
-            notifications.remove(index);
-            NotificationCenterPane.getNotificationCenterPane().refreshButton();
-        }
+        notifications.remove(index);
+        NotificationCenterPane.getNotificationCenterPane().refreshButton();
     }
 
     public Notification getNotification(int index){
@@ -40,10 +35,8 @@ public class NotificationCenter {
     }
 
     public void clearAllNotifications(){
-        synchronized (this) {
-            notifications.clear();
-            NotificationCenterPane.getNotificationCenterPane().refreshButton();
-        }
+        notifications.clear();
+        NotificationCenterPane.getNotificationCenterPane().refreshButton();
     }
 
 }
diff --git a/designer-base/src/main/java/com/fr/design/notification/ui/NotificationCenterDialog.java b/designer-base/src/main/java/com/fr/design/notification/ui/NotificationCenterDialog.java
index 62b2f9d69b..4868dceb14 100644
--- a/designer-base/src/main/java/com/fr/design/notification/ui/NotificationCenterDialog.java
+++ b/designer-base/src/main/java/com/fr/design/notification/ui/NotificationCenterDialog.java
@@ -2,7 +2,6 @@ package com.fr.design.notification.ui;
 
 import com.fr.design.gui.ilable.UILabel;
 import com.fr.design.layout.FRGUIPaneFactory;
-import com.fr.design.mainframe.DesignerContext;
 import com.fr.design.notification.Notification;
 import com.fr.design.notification.NotificationCenter;
 import java.awt.BorderLayout;
@@ -26,9 +25,8 @@ public class NotificationCenterDialog extends JDialog {
     private UILabel deleteLabel;
     private static final int NOTIFICATIONCOUNT = 5;
 
-    private static NotificationCenterDialog instance;
 
-    private NotificationCenterDialog(Frame parent) {
+    public NotificationCenterDialog(Frame parent) {
         super(parent);
         setTitle(com.fr.design.i18n.Toolkit.i18nText("Fine-Design_Basic_Notification"));
         setResizable(false);
@@ -42,13 +40,6 @@ public class NotificationCenterDialog extends JDialog {
         initComponents();
     }
 
-    public static NotificationCenterDialog getInstance() {
-        if (instance == null) {
-            instance = new NotificationCenterDialog(DesignerContext.getDesignerFrame());
-        }
-        return instance;
-    }
-
     private void initComponents() {
         centerPanel = FRGUIPaneFactory.createNColumnGridInnerContainer_S_Pane(1);
         addNotification();
@@ -89,9 +80,6 @@ public class NotificationCenterDialog extends JDialog {
         return deleteLabel;
     }
 
-    public void showDialog() {
-        this.setVisible(true);
-    }
 
     public void hideDialog() {
         this.dispose();
diff --git a/designer-base/src/main/java/com/fr/design/notification/ui/NotificationCenterPane.java b/designer-base/src/main/java/com/fr/design/notification/ui/NotificationCenterPane.java
index dfc89cce29..f5af0bfc06 100644
--- a/designer-base/src/main/java/com/fr/design/notification/ui/NotificationCenterPane.java
+++ b/designer-base/src/main/java/com/fr/design/notification/ui/NotificationCenterPane.java
@@ -4,6 +4,7 @@ import com.fr.design.constants.UIConstants;
 import com.fr.design.dialog.BasicPane;
 import com.fr.design.gui.ibutton.UIButton;
 import com.fr.design.i18n.Toolkit;
+import com.fr.design.mainframe.DesignerContext;
 import com.fr.design.notification.NotificationCenter;
 import com.fr.general.IOUtils;
 import java.awt.BorderLayout;
@@ -27,7 +28,8 @@ public class NotificationCenterPane extends BasicPane {
         notificationCenterButton.addMouseListener(new MouseAdapter() {
             @Override
             public void mouseClicked(MouseEvent e) {
-                NotificationCenterDialog.getInstance().showDialog();
+                NotificationCenterDialog notificationCenterDialog = new NotificationCenterDialog(DesignerContext.getDesignerFrame());
+                notificationCenterDialog.setVisible(true);
             }
         });
         this.setBackground(UIConstants.TEMPLATE_TAB_PANE_BACKGROUND);