diff --git a/AIStudio.Wpf.DiagramDesigner/Controls/DesignerCanvas.cs b/AIStudio.Wpf.DiagramDesigner/Controls/DesignerCanvas.cs
index f7b4da1..c47beaf 100644
--- a/AIStudio.Wpf.DiagramDesigner/Controls/DesignerCanvas.cs
+++ b/AIStudio.Wpf.DiagramDesigner/Controls/DesignerCanvas.cs
@@ -387,7 +387,7 @@ namespace AIStudio.Wpf.DiagramDesigner
                         if (SourceConnector == null)
                         {
                             //新建一个Part连接点
-                            SourceConnector = new Connector() { Content = new PartCreatedConnectorInfo(currentPoint.X, currentPoint.Y) };
+                            SourceConnector = new Connector() { Content = new PartCreatedConnectorInfo(currentPoint.X, currentPoint.Y), Tag = "虚拟的连接点" };
                         }
                     }
 
diff --git a/Demos/AIStudio.Wpf.DiagramDesigner.Demo/ViewModels/PortlessLinksViewModel.cs b/Demos/AIStudio.Wpf.DiagramDesigner.Demo/ViewModels/PortlessLinksViewModel.cs
index 5adb08f..31e497e 100644
--- a/Demos/AIStudio.Wpf.DiagramDesigner.Demo/ViewModels/PortlessLinksViewModel.cs
+++ b/Demos/AIStudio.Wpf.DiagramDesigner.Demo/ViewModels/PortlessLinksViewModel.cs
@@ -19,16 +19,19 @@ namespace AIStudio.Wpf.DiagramDesigner.Demo.ViewModels
             DiagramViewModel.ColorViewModel = new ColorViewModel();
             DiagramViewModel.ColorViewModel.FillColor.Color = System.Windows.Media.Colors.Orange;
 
-            DefaultDesignerItemViewModel node1 = new DefaultDesignerItemViewModel(DiagramViewModel) { Left = 50, Top = 50, Text = "1" };
+            DefaultDesignerItemViewModel node1 = new DefaultDesignerItemViewModel(DiagramViewModel) { Left = 50, Top = 80, Text = "1" };
+            node1.ClearConnectors();
             DiagramViewModel.Add(node1);
 
             DefaultDesignerItemViewModel node2 = new DefaultDesignerItemViewModel(DiagramViewModel) { Left = 300, Top = 50, Text = "2" };
+            node2.ClearConnectors();
             DiagramViewModel.Add(node2);
 
-            DefaultDesignerItemViewModel node3 = new DefaultDesignerItemViewModel(DiagramViewModel) { Left = 300, Top = 300, Text = "3" };
+            DefaultDesignerItemViewModel node3 = new DefaultDesignerItemViewModel(DiagramViewModel) { Left = 200, Top = 300, Text = "3" };
             DiagramViewModel.Add(node3);
 
-            DefaultDesignerItemViewModel node4 = new DefaultDesignerItemViewModel(DiagramViewModel) { Left = 50, Top = 300, Text = "4" };
+            DefaultDesignerItemViewModel node4 = new DefaultDesignerItemViewModel(DiagramViewModel) { Left = 80, Top = 200, Text = "4" };
+            node4.ClearConnectors();
             DiagramViewModel.Add(node4);
 
             ConnectionViewModel connector1 = new ConnectionViewModel(DiagramViewModel, node1.PortlessConnector, node2.PortlessConnector, DrawMode.ConnectingLineSmooth, RouterMode.RouterNormal);