diff --git a/AIStudio.Wpf.DiagramDesigner/Controls/ItemsContainer.cs b/AIStudio.Wpf.DiagramDesigner/Controls/ItemsContainer.cs
index a2e4ac8..5f2a6de 100644
--- a/AIStudio.Wpf.DiagramDesigner/Controls/ItemsContainer.cs
+++ b/AIStudio.Wpf.DiagramDesigner/Controls/ItemsContainer.cs
@@ -1,5 +1,6 @@
 using System;
 using System.ComponentModel;
+using System.Linq;
 using System.Runtime.CompilerServices;
 using System.Windows;
 using System.Windows.Controls;
@@ -146,11 +147,21 @@ namespace AIStudio.Wpf.DiagramDesigner
                 var currentPoint = e.GetPosition(this);
                 if (Math.Sqrt(Math.Pow(firstPoint.Value.X - currentPoint.X, 2) + Math.Pow(firstPoint.Value.Y - currentPoint.Y, 2)) > 5)
                 {
+                    firstPoint = null;
                     if (Info?.Children?.Count > 0)
                     {
                         var borders = VisualHelper.FindVisualChildren<BlockBorder>(this);
+                        BlockBorder innerblock = null;
+                        BlockDesignerItemViewModel dragObject = null;
+                        Point dragOffset = new Point();
                         foreach (var border in borders)
                         {
+                            var itemsContainer = VisualHelper.TryFindParent<ItemsContainer>(border);
+                            if (this != itemsContainer)
+                            {
+                                continue;
+                            }
+
                             var point = border.TransformToAncestor(this).Transform(new Point(0, 0));
                             var rect = new Rect(point.X, point.Y, border.ActualWidth, border.ActualHeight);
                             if (rect.Contains(currentPoint))
@@ -167,10 +178,10 @@ namespace AIStudio.Wpf.DiagramDesigner
                             if (canvas != null)
                             {
                                 canvas.SourceItemsContainer = this;
+                                e.Handled = true;
                             }
                         }
                     }
-                    firstPoint = null;
                 }
             }
         }
@@ -179,7 +190,6 @@ namespace AIStudio.Wpf.DiagramDesigner
             base.OnMouseUp(e);
 
             firstPoint = null;
-            DragObject = null;
         }
 
         public ConnectorOrientation Orientation
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/Container/ItemsContainerInfo.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/Container/ItemsContainerInfo.cs
index bf7fbef..ab294bc 100644
--- a/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/Container/ItemsContainerInfo.cs
+++ b/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/Container/ItemsContainerInfo.cs
@@ -227,19 +227,23 @@ namespace AIStudio.Wpf.DiagramDesigner
             Children.Remove(child);
         }
 
-        public List<ItemsContainerInfo> GetAllContain(ObservableCollection<BlockDesignerItemViewModel> children)
+        public List<ItemsContainerInfo> GetAllContain(ObservableCollection<BlockDesignerItemViewModel> children, bool self)
         {
             List <ItemsContainerInfo> itemsContainers= new List <ItemsContainerInfo>();
+            if (self)
+            {
+                itemsContainers.Add(this);
+            }
             if (children != null)
             {
                 foreach (var item in children)
                 {
                     if (item.Contains != null)
                     {
-                        itemsContainers.AddRange(item.Contains);
                         foreach (var contain in item.Contains)
                         {
-                            itemsContainers.AddRange(contain.GetAllContain(contain.Children));
+                            itemsContainers.Add(contain);
+                            itemsContainers.AddRange(contain.GetAllContain(contain.Children, false));
                         }
                     }
                 }
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DiagramViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DiagramViewModel.cs
index 3be1688..4851f91 100644
--- a/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DiagramViewModel.cs
+++ b/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DiagramViewModel.cs
@@ -3160,17 +3160,33 @@ namespace AIStudio.Wpf.DiagramDesigner
             {
                 if (port.GetBounds().IntersectsWith(blockDesignerItemViewModel.GetBounds())) //如果两个位置相交
                 {
-
-                    port.DataItem.ShowConnectors = true;
-                    if (port.CanAttachTo(blockDesignerItemViewModel) == true)
+                    var innerport = port.GetAllContain(port.Children, false).Where(p => p.GetBounds().IntersectsWith(blockDesignerItemViewModel.GetBounds())).OrderByDescending(p => p.ContainLevel).FirstOrDefault();
+                    if (innerport != null)
                     {
-                        port.BeAttachTo = true;
+                        innerport.DataItem.ShowConnectors = true;
+                        if (innerport.CanAttachTo(blockDesignerItemViewModel) == true)
+                        {
+                            innerport.BeAttachTo = true;
+                        }
+                        else
+                        {
+                            innerport.DisableAttachTo = true;
+                        }
+                        return innerport;
                     }
                     else
                     {
-                        port.DisableAttachTo = true;
+                        port.DataItem.ShowConnectors = true;
+                        if (port.CanAttachTo(blockDesignerItemViewModel) == true)
+                        {
+                            port.BeAttachTo = true;
+                        }
+                        else
+                        {
+                            port.DisableAttachTo = true;
+                        }
+                        return port;
                     }
-                    return port;
                 }
             }
 
@@ -3190,7 +3206,7 @@ namespace AIStudio.Wpf.DiagramDesigner
 
         public void ClearNearContain()
         {
-            Items.OfType<BlockDesignerItemViewModel>().ToList().SelectMany(n => n.Contains).Where(p => p.BeAttachTo == true || p.DisableAttachTo == true).ToList()
+            Items.OfType<BlockDesignerItemViewModel>().ToList().SelectMany(n => n.GetAllContain()).Where(p => p.BeAttachTo == true || p.DisableAttachTo == true).ToList()
               .ForEach(p => {
                   p.DisableAttachTo = false;
                   p.BeAttachTo = false;
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/BlockDesignerItemViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/BlockDesignerItemViewModel.cs
index 2abccef..6dbf62f 100644
--- a/AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/BlockDesignerItemViewModel.cs
+++ b/AIStudio.Wpf.DiagramDesigner/ViewModels/DefaultViewModel/BlockDesignerItemViewModel.cs
@@ -124,7 +124,7 @@ namespace AIStudio.Wpf.DiagramDesigner
         public virtual void AddChild(BlockDesignerItemViewModel child)
         {
             child.RemoveFromSelection();
-            this.AddToSelection(true, false);
+            this.GetRootParent.AddToSelection(true, true);
 
             System.Windows.Application.Current?.Dispatcher.BeginInvoke(new Action(async () => {
                 await Task.Delay(10);
@@ -136,7 +136,8 @@ namespace AIStudio.Wpf.DiagramDesigner
         public virtual void RemoveChild(BlockDesignerItemViewModel child)
         {
             this.RemoveFromSelection();
-            child.AddToSelection(true, false);
+
+            child.AddToSelection(true, true);
 
             System.Windows.Application.Current?.Dispatcher.BeginInvoke(new Action(async () => {
                 await Task.Delay(10);
@@ -155,6 +156,26 @@ namespace AIStudio.Wpf.DiagramDesigner
             {
                 return Contains?.FirstOrDefault();
             }
+        }       
+
+        public List<ItemsContainerInfo> GetAllContain()
+        {
+            return Contains.SelectMany(p => p.GetAllContain(p.Children, true)).ToList();
+        }
+
+        public BlockDesignerItemViewModel GetRootParent
+        {
+            get
+            {
+                if (ParentContain == null)
+                {
+                    return this;
+                }
+                else
+                {
+                    return ParentContain.DataItem.GetRootParent;
+                }
+            }
         }
     }
 }