diff --git a/AIStudio.Wpf.DiagramDesigner/Models/Values/ConstParameter.cs b/AIStudio.Wpf.DiagramDesigner/Models/Values/ConstParameter.cs
index 6c7cf02..3fdb703 100644
--- a/AIStudio.Wpf.DiagramDesigner/Models/Values/ConstParameter.cs
+++ b/AIStudio.Wpf.DiagramDesigner/Models/Values/ConstParameter.cs
@@ -10,19 +10,7 @@ namespace AIStudio.Wpf.DiagramDesigner
 {
     public class ConstParameter : BindableBase, IParameter
     {
-        private ISelectable _item;
-
-        public ISelectable Item
-        {
-            get
-            {
-                return _item;
-            }
-            set
-            {
-                SetProperty(ref _item, value);
-            }
-        }
+      
 
         private string _text;
 
@@ -53,7 +41,6 @@ namespace AIStudio.Wpf.DiagramDesigner
         }
 
 
-        public bool IsPublic { get; set; } = true;
 
         public void Add(object value)
         {
diff --git a/AIStudio.Wpf.DiagramDesigner/Models/Values/IParameter.cs b/AIStudio.Wpf.DiagramDesigner/Models/Values/IParameter.cs
index b12469e..c15a0c8 100644
--- a/AIStudio.Wpf.DiagramDesigner/Models/Values/IParameter.cs
+++ b/AIStudio.Wpf.DiagramDesigner/Models/Values/IParameter.cs
@@ -2,11 +2,6 @@
 {
     public interface IParameter
     {
-        ISelectable Item
-        {
-            get; set;
-        }
-        
         string Text
         {
             get; set;
@@ -17,11 +12,6 @@
             get; set;
         }
 
-        bool IsPublic
-        {
-            get; set;
-        }
-
         void Add(object value);
 
     }
diff --git a/AIStudio.Wpf.DiagramDesigner/Models/Values/VarParameter.cs b/AIStudio.Wpf.DiagramDesigner/Models/Values/VarParameter.cs
deleted file mode 100644
index 85cd1c5..0000000
--- a/AIStudio.Wpf.DiagramDesigner/Models/Values/VarParameter.cs
+++ /dev/null
@@ -1,10 +0,0 @@
-using System;
-using AIStudio.Wpf.DiagramDesigner;
-
-namespace AIStudio.Wpf.DiagramDesigner
-{
-    public class VarParameter : ConstParameter
-    {
-      
-    }
-}
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DesignerItemViewModelBase.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DesignerItemViewModelBase.cs
index 59f1a67..0b46d91 100644
--- a/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DesignerItemViewModelBase.cs
+++ b/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/DesignerItemViewModelBase.cs
@@ -435,6 +435,7 @@ namespace AIStudio.Wpf.DiagramDesigner
             {
                 Left = value.X;
                 Top = value.Y;
+                RaisePropertyChanged(nameof(TopLeft));
             }
         }
 
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/BlockViewModel/BlockDesignerItemViewModel.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/BlockViewModel/BlockDesignerItemViewModel.cs
index 117adf9..9f7305d 100644
--- a/AIStudio.Wpf.DiagramDesigner/ViewModels/BlockViewModel/BlockDesignerItemViewModel.cs
+++ b/AIStudio.Wpf.DiagramDesigner/ViewModels/BlockViewModel/BlockDesignerItemViewModel.cs
@@ -41,7 +41,7 @@ namespace AIStudio.Wpf.DiagramDesigner
             ItemHeight = double.NaN;
             AddConnector(new BlockConnectorInfo(this.Root, this, ConnectorOrientation.Top));
             AddConnector(new BlockConnectorInfo(this.Root, this, ConnectorOrientation.Bottom));
-            
+
         }
 
         protected override void Init(IDiagramViewModel root, bool initNew)
@@ -423,27 +423,29 @@ namespace AIStudio.Wpf.DiagramDesigner
         }
 
         #region 执行
-        public void Execute()
+        public async Task Execute()
         {
-            BeforeExecute();
-            Executing();
-            AfterExecute();
+            await BeforeExecute();
+            await Executing();
+            await AfterExecute();
         }
 
-        public virtual void BeforeExecute()
+        public virtual Task BeforeExecute()
         {
             IsExecuting = true;
+            return Task.CompletedTask;
         }
 
-        public virtual void Executing()
+        public virtual Task Executing()
         {
-
+            return Task.CompletedTask;
         }
 
-        public virtual void AfterExecute()
+        public virtual async Task AfterExecute()
         {
             IsExecuting = false;
-            Next?.Execute();
+            if (Next != null)
+                await Next.Execute();
         }
 
         public virtual object GetResult()