diff --git a/AIStudio.Wpf.DiagramDesigner/Controls/BlockDragThumb.cs b/AIStudio.Wpf.DiagramDesigner/Controls/BlockDragThumb.cs
new file mode 100644
index 0000000..56b1385
--- /dev/null
+++ b/AIStudio.Wpf.DiagramDesigner/Controls/BlockDragThumb.cs
@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Threading;
+using System.Windows;
+using System.Windows.Controls.Primitives;
+using System.Windows.Input;
+using System.Windows.Media;
+using AIStudio.Wpf.DiagramDesigner.Geometrys;
+
+namespace AIStudio.Wpf.DiagramDesigner.Controls
+{
+    public class BlockDragThumb : DragThumb
+    {
+        BlockDesignerItemViewModel DesignerItem
+        {
+            get
+            {
+                return DataContext as BlockDesignerItemViewModel;
+            }
+        }
+
+        private Point? firstPoint;
+        protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
+        {
+            base.OnPreviewMouseLeftButtonDown(e);
+            if (e.LeftButton == MouseButtonState.Pressed &&  firstPoint == null)
+            {
+                firstPoint = e.GetPosition(this);
+                DesignerItem.BeforeExecute();
+            }
+        }
+
+        protected override void OnPreviewMouseLeftButtonUp(MouseButtonEventArgs e)
+        {
+            base.OnPreviewMouseLeftButtonDown(e);
+
+            if (firstPoint == e.GetPosition(this))
+            {              
+                DesignerItem.EditCommand?.Execute(e.GetPosition(this));
+                firstPoint = null;
+            }
+
+        }
+
+    }
+}
diff --git a/AIStudio.Wpf.DiagramDesigner/Themes/DiagramControl.xaml b/AIStudio.Wpf.DiagramDesigner/Themes/DiagramControl.xaml
index ed3ce7c..21fa8da 100644
--- a/AIStudio.Wpf.DiagramDesigner/Themes/DiagramControl.xaml
+++ b/AIStudio.Wpf.DiagramDesigner/Themes/DiagramControl.xaml
@@ -851,12 +851,12 @@
                         </Grid.ContextMenu>
 
                         <!-- PART_DragThumb -->
-                        <c:DragThumb x:Name="PART_DragThumb" 
+                        <c:BlockDragThumb x:Name="PART_DragThumb" 
                                                             Cursor="SizeAll" >
-                            <c:DragThumb.InputBindings>
+                            <c:BlockDragThumb.InputBindings>
                                 <MouseBinding MouseAction="LeftDoubleClick" Command="{Binding EditCommand}" CommandParameter="{Binding }" />
-                            </c:DragThumb.InputBindings>
-                        </c:DragThumb>
+                            </c:BlockDragThumb.InputBindings>
+                        </c:BlockDragThumb>
 
                         <Grid RenderTransformOrigin="0.5,0.5" >
                             <!-- PART_ContentPresenter -->
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/BlockViewModel/BlockDesignerItemViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/BlockViewModel/BlockDesignerItemViewModel.cs
index 83070b6..515c455 100644
--- a/AIStudio.Wpf.DiagramDesigner/ViewModels/BlockViewModel/BlockDesignerItemViewModel.cs
+++ b/AIStudio.Wpf.DiagramDesigner/ViewModels/BlockViewModel/BlockDesignerItemViewModel.cs
@@ -423,9 +423,14 @@ namespace AIStudio.Wpf.DiagramDesigner
         }
 
         #region 执行
+        protected override async void ExecuteEditCommand(object param)
+        {
+            await (this.GetFirst() ?? this).Execute();           
+        }
+
         public async Task Execute()
         {
-            await BeforeExecute();
+            await BeforeExecute();            
             await Executing();
             await AfterExecute();
         }