diff --git a/AIStudio.Wpf.DiagramApp/ViewModels/MindViewModel.cs b/AIStudio.Wpf.DiagramApp/ViewModels/MindViewModel.cs
index 9556dfb..a807a87 100644
--- a/AIStudio.Wpf.DiagramApp/ViewModels/MindViewModel.cs
+++ b/AIStudio.Wpf.DiagramApp/ViewModels/MindViewModel.cs
@@ -55,10 +55,10 @@ namespace AIStudio.Wpf.Flowchart
             base.Init();
 
             MindNode level1node = new MindNode(DiagramViewModel, Mind.NodeLevel.Level1, MindType) { Text = "思维导图" };
-            //level1node.Left = 220;
-            //level1node.Top = 15;
+            level1node.Left = 15;
+            level1node.Top = 200;
             DiagramViewModel.DirectAddItemCommand.Execute(level1node);
-            DiagramViewModel.CenterMoveCommand.Execute(level1node);
+            //DiagramViewModel.CenterMoveCommand.Execute(level1node);
 
             MindNode level2node1_1 = new MindNode(DiagramViewModel, Mind.NodeLevel.Level2, MindType) { Text = "分支主题1" };
             level1node.AddChild(level2node1_1);
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DiagramViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DiagramViewModel.cs
index 9e00235..f9bf3d4 100644
--- a/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DiagramViewModel.cs
+++ b/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DiagramViewModel.cs
@@ -1,12 +1,9 @@
 using System;
-using System.Collections;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.ComponentModel;
-using System.Data.Common;
 using System.Linq;
 using System.Reactive.Linq;
-using System.Reflection.Metadata;
 using System.Windows;
 using System.Windows.Input;
 using System.Windows.Media;
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/SelectableViewModelBase.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/SelectableViewModelBase.cs
index 112dc36..9a3d507 100644
--- a/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/SelectableViewModelBase.cs
+++ b/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/SelectableViewModelBase.cs
@@ -166,11 +166,6 @@ namespace AIStudio.Wpf.DiagramDesigner
             }
         }
 
-        bool IsEditing
-        {
-            get; set;
-        }
-
         private bool _isEditing = true;
         public bool IsEditing
         {
diff --git a/AIStudio.Wpf.Mind/Helpers/DirectoryLayout.cs b/AIStudio.Wpf.Mind/Helpers/DirectoryLayout.cs
index 6541dd2..1f2a89a 100644
--- a/AIStudio.Wpf.Mind/Helpers/DirectoryLayout.cs
+++ b/AIStudio.Wpf.Mind/Helpers/DirectoryLayout.cs
@@ -96,7 +96,7 @@ namespace AIStudio.Wpf.Mind.Helpers
             var size = MeasureOverride(mindNode);
             ArrangeOverride(mindNode);
 
-            mindNode.Root.BringToFrontCommand.Execute(new SelectableDesignerItemViewModelBase[] { mindNode });
+            mindNode.Root.BringToFrontCommand.Execute(mindNode.Root.Items.OfType<DesignerItemViewModelBase>());
 
             mindNode.GetLevel1Node().LayoutUpdating = false;
         }
diff --git a/AIStudio.Wpf.Mind/Helpers/FishBoneLayout.cs b/AIStudio.Wpf.Mind/Helpers/FishBoneLayout.cs
index 3852b6b..ffb9650 100644
--- a/AIStudio.Wpf.Mind/Helpers/FishBoneLayout.cs
+++ b/AIStudio.Wpf.Mind/Helpers/FishBoneLayout.cs
@@ -127,7 +127,7 @@ namespace AIStudio.Wpf.Mind.Helpers
             var size = MeasureOverride(mindNode);
             ArrangeOverride(mindNode);
 
-            mindNode.Root.BringToFrontCommand.Execute(new SelectableDesignerItemViewModelBase[] { mindNode });
+            mindNode.Root.BringToFrontCommand.Execute(mindNode.Root.Items.OfType<DesignerItemViewModelBase>());
 
             mindNode.GetLevel1Node().LayoutUpdating = false;
         }
@@ -151,7 +151,7 @@ namespace AIStudio.Wpf.Mind.Helpers
                 {
                     var childrensizes = mindNode.Children.Select(p => MeasureOverride(p, mindNode.IsExpanded && isExpanded)).ToArray();
                     var lastchildsize = childrensizes.LastOrDefault();
-                    sizewithSpacing = new SizeBase(sizewithSpacing.Width + childrensizes.Sum(p => p.Height) - lastchildsize.Height / 2 + lastchildsize.Width, sizewithSpacing.Height + childrensizes.Sum(p => p.Height));
+                    sizewithSpacing = new SizeBase(sizewithSpacing.Height + childrensizes.Sum(p => p.Height) - lastchildsize.Height / 2 + lastchildsize.Width, sizewithSpacing.Height + childrensizes.Sum(p => p.Height));
                 }
                 else if (mindNode.NodeLevel == NodeLevel.Level3 || mindNode.NodeLevel == NodeLevel.Level4)
                 {
@@ -200,7 +200,7 @@ namespace AIStudio.Wpf.Mind.Helpers
                     foreach (var child in bottoms)
                     {
                         child.Left = bottomleft + child.Spacing.Width + child.Offset.X;
-                        child.Top = bottomtop + child.ItemHeight + child.Spacing.Height + child.Offset.Y;
+                        child.Top = bottomtop + child.Spacing.Height + child.Offset.Y;
                         child.DesiredPosition = child.Position;
                         bottomleft += child.DesiredSize.Width;
 
@@ -217,11 +217,10 @@ namespace AIStudio.Wpf.Mind.Helpers
             {
                 if (mindNode.ConnectorOrientation == ConnectorOrientation.BottomLeft)
                 {
-                    double left = mindNode.Left - mindNode.Spacing.Width + mindNode.DesiredSize.Height;
+                    double left = mindNode.Left + mindNode.ItemHeight + mindNode.Spacing.Height;
                     double top = mindNode.Top - mindNode.Spacing.Height;
                     if (mindNode.Children?.Count > 0)
                     {
-
                         foreach (var child in mindNode.Children)
                         {
                             child.Left = left + child.DesiredSize.Height - child.ItemHeight / 2 - child.Spacing.Height + child.Offset.X;
@@ -241,23 +240,22 @@ namespace AIStudio.Wpf.Mind.Helpers
                 }
                 else
                 {
-                    double left = mindNode.Left - mindNode.Spacing.Width + mindNode.DesiredSize.Height;
-                    double top = mindNode.Top - mindNode.Spacing.Height;
+                    double left = mindNode.Left + mindNode.ItemHeight + mindNode.Spacing.Height;
+                    double top = mindNode.Top + mindNode.ItemHeight + mindNode.Spacing.Height;
                     if (mindNode.Children?.Count > 0)
                     {
-
                         foreach (var child in mindNode.Children)
                         {
                             child.Left = left + child.DesiredSize.Height - child.ItemHeight / 2 - child.Spacing.Height + child.Offset.X;
-                            child.Top = top - child.DesiredSize.Height + child.ItemHeight / 2 + child.Spacing.Height + child.Offset.Y;
+                            child.Top = top + child.DesiredSize.Height - child.ItemHeight / 2 - child.Spacing.Height + child.Offset.Y;
                             child.DesiredPosition = child.Position;
-                            top -= child.DesiredSize.Height;
+                            top += child.DesiredSize.Height;
                             left += child.DesiredSize.Height;
 
                             ArrangeOverride(child);
 
                             var connect = mindNode.Root?.Items.OfType<ConnectionViewModel>().FirstOrDefault(p => p.SourceConnectorInfo?.DataItem == mindNode && p.SinkConnectorInfoFully?.DataItem == child);
-                            connect?.SetSourcePort(mindNode.BottomLeftConnector);
+                            connect?.SetSourcePort(mindNode.TopLeftConnector);
                             connect?.SetSinkPort(child.LeftConnector);
                             connect?.SetVisible(child.Visible);
                         }
diff --git a/AIStudio.Wpf.Mind/Helpers/LogicalLayout.cs b/AIStudio.Wpf.Mind/Helpers/LogicalLayout.cs
index a13ba6a..34b1468 100644
--- a/AIStudio.Wpf.Mind/Helpers/LogicalLayout.cs
+++ b/AIStudio.Wpf.Mind/Helpers/LogicalLayout.cs
@@ -95,7 +95,7 @@ namespace AIStudio.Wpf.Mind.Helpers
             var size = MeasureOverride(mindNode);
             ArrangeOverride(mindNode);
 
-            mindNode.Root.BringToFrontCommand.Execute(new SelectableDesignerItemViewModelBase[] { mindNode });
+            mindNode.Root.BringToFrontCommand.Execute(mindNode.Root.Items.OfType<DesignerItemViewModelBase>());
 
             mindNode.GetLevel1Node().LayoutUpdating = false;
         }
diff --git a/AIStudio.Wpf.Mind/Helpers/MindLayout.cs b/AIStudio.Wpf.Mind/Helpers/MindLayout.cs
index 0440ab2..8097374 100644
--- a/AIStudio.Wpf.Mind/Helpers/MindLayout.cs
+++ b/AIStudio.Wpf.Mind/Helpers/MindLayout.cs
@@ -97,7 +97,7 @@ namespace AIStudio.Wpf.Mind.Helpers
             var size = MeasureOverride(mindNode);
             ArrangeOverride(mindNode);
 
-            mindNode.Root.BringToFrontCommand.Execute(new SelectableDesignerItemViewModelBase[] { mindNode });
+            mindNode.Root.BringToFrontCommand.Execute(mindNode.Root.Items.OfType<DesignerItemViewModelBase>());
 
             mindNode.GetLevel1Node().LayoutUpdating = false;
         }
diff --git a/Directory.Build.Props b/Directory.Build.Props
index 4d652c4..b3d0e9d 100644
--- a/Directory.Build.Props
+++ b/Directory.Build.Props
@@ -1,7 +1,7 @@
 <Project>
   <!-- Project properties -->
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp3.1;net5.0-windows</TargetFrameworks>
+    <TargetFrameworks>net461;netcoreapp3.1;net5.0-windows</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">