diff --git a/AIStudio.Wpf.DiagramDesigner/AttachedProperties/DragAndDropProps.cs b/AIStudio.Wpf.DiagramDesigner/AttachedProperties/DragAndDropProps.cs
index 1cc3f43..b266ca7 100644
--- a/AIStudio.Wpf.DiagramDesigner/AttachedProperties/DragAndDropProps.cs
+++ b/AIStudio.Wpf.DiagramDesigner/AttachedProperties/DragAndDropProps.cs
@@ -10,7 +10,7 @@ using AIStudio.Wpf.DiagramDesigner.Helpers;
 
 namespace AIStudio.Wpf.DiagramDesigner
 {
-    public static class DragAndDropProps     
+    public static class DragAndDropProps
     {
         #region EnabledForDrag
 
@@ -31,10 +31,10 @@ namespace AIStudio.Wpf.DiagramDesigner
 
         private static void OnEnabledForDragChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
         {
-            FrameworkElement fe = (FrameworkElement) d;
+            FrameworkElement fe = (FrameworkElement)d;
 
 
-            if((bool)e.NewValue)
+            if ((bool)e.NewValue)
             {
                 fe.PreviewMouseDown += Fe_PreviewMouseDown;
                 fe.MouseMove += Fe_MouseMove;
@@ -67,10 +67,15 @@ namespace AIStudio.Wpf.DiagramDesigner
 
         static void Fe_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
         {
-            Point? dragStartPoint = GetDragStartPoint((DependencyObject)sender);
-
             if (e.LeftButton != MouseButtonState.Pressed)
-                dragStartPoint = null;
+            {
+                return;
+            }
+
+            Point? dragStartPoint = GetDragStartPoint((DependencyObject)sender);
+            var point = e.GetPosition((IInputElement)sender);
+            if (dragStartPoint == point)
+                return;
 
             if (dragStartPoint.HasValue && ((FrameworkElement)sender).DataContext is ToolBoxData toolBoxData)
             {
diff --git a/AIStudio.Wpf.DiagramDesigner/Models/Values/ConstParameter.cs b/AIStudio.Wpf.DiagramDesigner/Models/Values/ConstParameter.cs
index 8f523df..6c7cf02 100644
--- a/AIStudio.Wpf.DiagramDesigner/Models/Values/ConstParameter.cs
+++ b/AIStudio.Wpf.DiagramDesigner/Models/Values/ConstParameter.cs
@@ -10,6 +10,34 @@ 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;
+
+        public string Text
+        {
+            get
+            {
+                return _text;
+            }
+            set
+            {
+                SetProperty(ref _text, value);
+            }
+        }
+
         private object _value;
 
         public object Value
@@ -24,6 +52,9 @@ namespace AIStudio.Wpf.DiagramDesigner
             }
         }
 
+
+        public bool IsPublic { get; set; } = true;
+
         public void Add(object value)
         {
             if (double.TryParse(Value?.ToString() ?? "", out var value1) && double.TryParse(value?.ToString() ?? "", out var value2))
diff --git a/AIStudio.Wpf.DiagramDesigner/Models/Values/IGroup.cs b/AIStudio.Wpf.DiagramDesigner/Models/Values/IGroup.cs
new file mode 100644
index 0000000..dc0ccec
--- /dev/null
+++ b/AIStudio.Wpf.DiagramDesigner/Models/Values/IGroup.cs
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AIStudio.Wpf.DiagramDesigner
+{
+    public interface IGroup
+    {
+        string Text
+        {
+            get;
+        }
+    }
+}
diff --git a/AIStudio.Wpf.DiagramDesigner/Models/Values/IParameter.cs b/AIStudio.Wpf.DiagramDesigner/Models/Values/IParameter.cs
index edb65cc..b12469e 100644
--- a/AIStudio.Wpf.DiagramDesigner/Models/Values/IParameter.cs
+++ b/AIStudio.Wpf.DiagramDesigner/Models/Values/IParameter.cs
@@ -1,18 +1,28 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace AIStudio.Wpf.DiagramDesigner
+namespace AIStudio.Wpf.DiagramDesigner
 {
     public interface IParameter
     {
+        ISelectable Item
+        {
+            get; set;
+        }
+        
+        string Text
+        {
+            get; set;
+        }
+
         object Value
         {
             get; set;
         }
 
+        bool IsPublic
+        {
+            get; set;
+        }
+
         void Add(object value);
+
     }
 }
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/Interface/ISelectable.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/Interface/ISelectable.cs
index 2b298a7..9ec63ea 100644
--- a/AIStudio.Wpf.DiagramDesigner/ViewModels/Interface/ISelectable.cs
+++ b/AIStudio.Wpf.DiagramDesigner/ViewModels/Interface/ISelectable.cs
@@ -23,6 +23,11 @@ namespace AIStudio.Wpf.DiagramDesigner
             get; set;
         }
 
+        string Text
+        {
+            get; set;
+        }
+
         //新建完处于编辑状态
         bool InitIsEditing
         {