diff --git a/TNodeCore/Attribute/GraphUsageAttribute.cs b/TNodeCore/Attribute/GraphUsageAttribute.cs
index af08872..4eb9151 100644
--- a/TNodeCore/Attribute/GraphUsageAttribute.cs
+++ b/TNodeCore/Attribute/GraphUsageAttribute.cs
@@ -16,15 +16,14 @@ namespace TNodeCore.Attribute{
     public class GraphUsageAttribute:System.Attribute{
         public readonly Type GraphDataType;
         public string Category;
-        public GraphUsageAttribute(Type t,string category = null){
+        public GraphUsageAttribute(Type t,string category = "default"){
             //check if the type t is graph
             if(!typeof(GraphData).IsAssignableFrom(t)){
                 throw new Exception("The type used on Graph Usage must be a graph");
             }
             GraphDataType = t;
-            if (category != null){
-                Category = category;
-            }
+            Category = category;
+           
         }
     }
 
diff --git a/TNodeCore/DataWrapper.cs b/TNodeCore/DataWrapper.cs
index 64e96ea..92ba218 100644
--- a/TNodeCore/DataWrapper.cs
+++ b/TNodeCore/DataWrapper.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using UnityEditor;
 using UnityEngine;
 
 namespace TNodeCore{
@@ -34,6 +35,7 @@ namespace TNodeCore{
             var fieldInfo = data.GetType().GetField(path);
             return fieldInfo.GetValue(data);
         }
+        
         public virtual TData GetData(){
             return data;
         }
diff --git a/TNodeCore/Models/BlackboardDragNodeData.cs b/TNodeCore/Models/BlackboardDragNodeData.cs
index 0f1622f..120fd77 100644
--- a/TNodeCore/Models/BlackboardDragNodeData.cs
+++ b/TNodeCore/Models/BlackboardDragNodeData.cs
@@ -7,17 +7,25 @@ using UnityEngine;
 namespace TNodeCore.Models{
     [Serializable]
     [InternalModel]
-    public class BlackboardDragNodeData:NodeData{
+    public class BlackboardDragNodeData:RuntimeNodeData{
         public string blackDragData;
-        [SerializeReference]
-        public BlackboardData blackboardData;
-        
-        [Output("",PortNameHandling.MemberType,TypeHandling.Implemented)] 
-        public object Value => blackboardData.GetValue(blackDragData);
+      
+        /// <summary>
+        /// it's very hacky way to get blackboard data ,even when the value is null,type info is not null!
+        /// </summary>
+        /// TODO : The type handling in a safer way in the future
+        [Output("",PortNameHandling.MemberType,TypeHandling.Implemented)]
+        public object Value => BlackboardData.GetValue(blackDragData);
  
         public BlackboardDragNodeData(){
             
         }
         
     }
+    [Serializable]
+    public class RuntimeNodeData:NodeData{
+   
+        public BlackboardData BlackboardData{ get; set; }
+        
+    }
 }
\ No newline at end of file
diff --git a/TNodeCore/Runtime/RuntimeGraph.cs b/TNodeCore/Runtime/RuntimeGraph.cs
index 235f792..11dd5c8 100644
--- a/TNodeCore/Runtime/RuntimeGraph.cs
+++ b/TNodeCore/Runtime/RuntimeGraph.cs
@@ -16,6 +16,9 @@ namespace TNodeCore.Runtime{
             [NonSerialized]
             public readonly List<RuntimeNode> TopologicalOrder = new List<RuntimeNode>();
             public readonly List<RuntimeNode> EntryNodes = new List<RuntimeNode>();
+            /// <summary>
+            /// elements are read only ,do not modify them
+            /// </summary>
             public readonly Dictionary<string, RuntimeNode> RuntimeNodes;
             public void DependencyTraversal(RuntimeNode runtimeNode){
                 var links = runtimeNode.InputLink;
@@ -26,7 +29,7 @@ namespace TNodeCore.Runtime{
                 }
                 runtimeNode.NodeData.Process();
             }
-
+            
             public void HandlingLink(NodeLink nodeLink){
                 var inNode = RuntimeNodes[nodeLink.inPort.nodeDataId];
                 var outNode = RuntimeNodes[nodeLink.outPort.nodeDataId];
@@ -125,6 +128,12 @@ namespace TNodeCore.Runtime{
             RuntimeNodes[inNode.id].InputLink.Add(linkData);
             
         }
+        public List<RuntimeNode> GetRuntimeNodesOfType<T>(){
+            return RuntimeNodes.Values.Where(x => x.NodeType == typeof(T)).ToList();
+        }
+        public  List<RuntimeNode> GetRuntimeNodesOfType(Type type){
+            return RuntimeNodes.Values.Where(x => x.NodeType == type).ToList();
+        }
         private void ModifyOrCreateOutNode(NodeLink linkData){
             var outNodeId = linkData.outPort.nodeDataId;
             var outNode = graphData.NodeDictionary[outNodeId];
diff --git a/TNodeCore/Runtime/RuntimeNode.cs b/TNodeCore/Runtime/RuntimeNode.cs
index 515f840..e4b435a 100644
--- a/TNodeCore/Runtime/RuntimeNode.cs
+++ b/TNodeCore/Runtime/RuntimeNode.cs
@@ -15,7 +15,7 @@ namespace TNodeCore.Runtime{
         public List<NodeLink> OutputLink = new List<NodeLink>();
         //Cache node data type for fast access
         private readonly Type _type;
-
+        public Type NodeType => _type;
 
         public void SetInput(string portName,object value){
             _portAccessors[portName].SetValue(this.NodeData,value);
diff --git a/TNodeCore/RuntimeCache/RuntimeCache.cs b/TNodeCore/RuntimeCache/RuntimeCache.cs
index 5eb6068..932890b 100644
--- a/TNodeCore/RuntimeCache/RuntimeCache.cs
+++ b/TNodeCore/RuntimeCache/RuntimeCache.cs
@@ -80,10 +80,7 @@ namespace TNodeCore.RuntimeCache{
                     }
                 }
             }
-            
-            
         }
-
         private void AddTypeToCache(Type type,System.Attribute attribute){
             //Check if the type is a blackboard data type
             if(typeof(BlackboardData).IsAssignableFrom(type)){
diff --git a/TNodeGraphViewImpl/Editor/Cache/NodeEditorExtensions.cs b/TNodeGraphViewImpl/Editor/Cache/NodeEditorExtensions.cs
index 5d55934..fcdcb48 100644
--- a/TNodeGraphViewImpl/Editor/Cache/NodeEditorExtensions.cs
+++ b/TNodeGraphViewImpl/Editor/Cache/NodeEditorExtensions.cs
@@ -18,8 +18,7 @@ namespace TNodeGraphViewImpl.Editor.Cache{
     /// Internal singleton class for caching TNode reflection Data.
     /// </summary>
     internal class NodeEditorTypeDictionary:Dictionary<Type, Type>{
-        private class NodeEditorTypeDictionaryComparer : IEqualityComparer<Type>
-        {
+        private class NodeEditorTypeDictionaryComparer : IEqualityComparer<Type>{
             public bool Equals(Type x, Type y){
                 return x?.ToString() == y?.ToString();
             }
@@ -28,11 +27,9 @@ namespace TNodeGraphViewImpl.Editor.Cache{
                 return obj.ToString().GetHashCode();
             }
         }
-
         public NodeEditorTypeDictionary():base(new NodeEditorTypeDictionaryComparer()){
             
         }
-
     }
     
     internal class NodeEditorSingleton{
@@ -132,6 +129,10 @@ namespace TNodeGraphViewImpl.Editor.Cache{
             var instance = (T)Activator.CreateInstance(implementedType);
             return instance;
         }
+        public static string GetTypeCategory(Type type){
+            var category = type.GetCustomAttribute<GraphUsageAttribute>();
+            return category?.Category ?? "";
+        }
         
         /// <summary>
         /// by given a generic type t,return the implementation instance  of the generic type
@@ -190,6 +191,13 @@ namespace TNodeGraphViewImpl.Editor.Cache{
             }
             return new List<Type>();
         }
+
+        public static List<string> GetGraphCategories(Type t){
+            var list = NodeEditorSingleton.Instance.GraphDataUsage[t];
+            //Merge same category
+            var res = list.Select(x=>x.GetCustomAttribute<GraphUsageAttribute>().Category).Distinct().ToList();
+            return res;
+        }
         public static BlackboardData GetAppropriateBlackboardData(Type t){
             if (NodeEditorSingleton.Instance.GraphBlackboard.ContainsKey(t)){
                 return (BlackboardData)Activator.CreateInstance(NodeEditorSingleton.Instance.GraphBlackboard[t]);
diff --git a/TNodeGraphViewImpl/Editor/GraphBlackboard/BlackboardField.cs b/TNodeGraphViewImpl/Editor/GraphBlackboard/BlackboardField.cs
index 93470ef..e37882f 100644
--- a/TNodeGraphViewImpl/Editor/GraphBlackboard/BlackboardField.cs
+++ b/TNodeGraphViewImpl/Editor/GraphBlackboard/BlackboardField.cs
@@ -1,9 +1,9 @@
 using UnityEditor.Experimental.GraphView;
 
 namespace TNodeGraphViewImpl.Editor.GraphBlackboard{
-    public class BlackboardPropertyField:BlackboardField{
+    public class BlackboardField:UnityEditor.Experimental.GraphView.BlackboardField{
          public BlackboardProperty.BlackboardProperty BlackboardProperty;
-         public BlackboardPropertyField(BlackboardProperty.BlackboardProperty blackboardProperty):base(null,blackboardProperty.PropertyName,null){
+         public BlackboardField(BlackboardProperty.BlackboardProperty blackboardProperty):base(null,blackboardProperty.PropertyName,null){
                 BlackboardProperty = blackboardProperty;
          }
          
diff --git a/TNodeGraphViewImpl/Editor/GraphBlackboard/DefaultGraphBlackboardView.cs b/TNodeGraphViewImpl/Editor/GraphBlackboard/DefaultGraphBlackboardView.cs
index 129d9ea..499bc5c 100644
--- a/TNodeGraphViewImpl/Editor/GraphBlackboard/DefaultGraphBlackboardView.cs
+++ b/TNodeGraphViewImpl/Editor/GraphBlackboard/DefaultGraphBlackboardView.cs
@@ -30,7 +30,7 @@ namespace TNodeGraphViewImpl.Editor.GraphBlackboard{
                 //skip if the field is a list or Ilist
                 if (!typeof(IList).IsAssignableFrom(field.FieldType)){
                     VisualElement visualElement = new VisualElement();
-                    var propertyField = new BlackboardPropertyField(new BlackboardProperty.BlackboardProperty(field.Name,field.FieldType));
+                    var propertyField = new BlackboardField(new BlackboardProperty.BlackboardProperty(field.Name,field.FieldType));
                     var foldoutData = new Foldout{
                         text = field.Name
                     };
diff --git a/TNodeGraphViewImpl/Editor/NodeGraphView/DataGraphView.cs b/TNodeGraphViewImpl/Editor/NodeGraphView/DataGraphView.cs
index 216cb24..fcab94f 100644
--- a/TNodeGraphViewImpl/Editor/NodeGraphView/DataGraphView.cs
+++ b/TNodeGraphViewImpl/Editor/NodeGraphView/DataGraphView.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Reflection;
 using TNode.Editor.Inspector;
 using TNode.Editor.Search;
 using TNodeCore.Editor.Blackboard;
@@ -12,13 +13,12 @@ using TNodeCore.Runtime;
 using TNodeGraphViewImpl.Editor.Cache;
 using TNodeGraphViewImpl.Editor.GraphBlackboard;
 using TNodeGraphViewImpl.Editor.NodeViews;
+using TNodeGraphViewImpl.Editor.Search;
 using UnityEditor;
 using UnityEditor.Experimental.GraphView;
 using UnityEngine;
 using UnityEngine.UIElements;
-
-
-
+using BlackboardField = TNodeGraphViewImpl.Editor.GraphBlackboard.BlackboardField;
 using Edge = UnityEditor.Experimental.GraphView.Edge;
 
 namespace TNodeGraphViewImpl.Editor.NodeGraphView{
@@ -216,12 +216,12 @@ namespace TNodeGraphViewImpl.Editor.NodeGraphView{
         private void OnDragPerform(DragPerformEvent evt){
         
             if (DragAndDrop.GetGenericData("DragSelection") is List<ISelectable>{Count: > 0} data){
-                var blackboardFields = data.OfType<BlackboardPropertyField >();
+                var blackboardFields = data.OfType<BlackboardField >();
                 foreach (var selectable in blackboardFields){
                     if(selectable is { } field) {
                         //Make a constructor of  BlackboardDragNodeData<field.PropertyType > by reflection
                         var dragNodeData = NodeCreator.InstantiateNodeData<BlackboardDragNodeData>();
-                        dragNodeData.blackboardData = GetBlackboardData();
+                        dragNodeData.BlackboardData = GetBlackboardData();
                         dragNodeData.blackDragData = field.BlackboardProperty.PropertyName;
                         AddTNode(dragNodeData,new Rect(evt.mousePosition,new Vector2(200,200)));
                     }
@@ -231,17 +231,11 @@ namespace TNodeGraphViewImpl.Editor.NodeGraphView{
         }
 
         private void OnDragUpdated(DragUpdatedEvent evt){
-            
             //check if the drag data is BlackboardField
-
             if (DragAndDrop.GetGenericData("DragSelection") is List<ISelectable>{Count: > 0} data){
                 DragAndDrop.visualMode = DragAndDropVisualMode.Move;
-     
             }
-            
-
         }
-
         #endregion
 
 
@@ -263,10 +257,12 @@ namespace TNodeGraphViewImpl.Editor.NodeGraphView{
                 //Get the node type
                 var nodeType = dataNode.GetType();
                 //Get the derived type of NodeAttribute View from the node type
-           
+                if (dataNode is RuntimeNodeData runtimeNodeData){
+                    runtimeNodeData.BlackboardData = GetBlackboardData();
+                }
                 var nodePos = Owner.graphEditorData.graphElementsData.
                     FirstOrDefault(x => x.guid == dataNode.id)?.pos??new Rect(0,0,200,200);
-                
+      
                 AddTNode(dataNode,nodePos);
             }
 
@@ -403,10 +399,20 @@ namespace TNodeGraphViewImpl.Editor.NodeGraphView{
                 _data.blackboardData = NodeEditorExtensions.GetAppropriateBlackboardData(_data.GetType());
             }
         }
-
-
+        //TODO:Handling implicit conversion when two port types are different but compatible
+        private static bool HasImplicitConversion(Type baseType, Type targetType)
+        {
+            return baseType.GetMethods(BindingFlags.Public | BindingFlags.Static)
+                .Where(mi => mi.Name == "op_Implicit" && mi.ReturnType == targetType)
+                .Any(mi => {
+                    ParameterInfo pi = mi.GetParameters().FirstOrDefault();
+                    return pi != null && pi.ParameterType == baseType;
+                });
+        }
         public override List<Port> GetCompatiblePorts(Port startPort, NodeAdapter nodeAdapter){
-            return ports.Where(x => x.portType == startPort.portType || x.portType.IsAssignableFrom(startPort.portType)).ToList();
+            
+            return  ports.Where(x => startPort!=x &&  (x.portType == startPort.portType || x.portType.IsAssignableFrom(startPort.portType))).ToList();
+        
         }
 
         public virtual void OnGraphViewCreate(){
diff --git a/TNodeGraphViewImpl/Editor/NodeViews/DragNodeView.cs b/TNodeGraphViewImpl/Editor/NodeViews/DragNodeView.cs
index 8bce179..35ca0b0 100644
--- a/TNodeGraphViewImpl/Editor/NodeViews/DragNodeView.cs
+++ b/TNodeGraphViewImpl/Editor/NodeViews/DragNodeView.cs
@@ -1,6 +1,13 @@
 using TNodeCore.Attribute;
+using TNodeCore.Editor.Serialization;
 using TNodeCore.Models;
 using TNodeGraphViewImpl.Editor.NodeViews;
+using UnityEditor;
+using UnityEditor.Experimental.GraphView;
+using UnityEditor.Graphs;
+using UnityEditor.UIElements;
+using UnityEngine;
+using UnityEngine.UIElements;
 
 namespace TNode.Editor.NodeViews{
     [ViewComponent]
@@ -8,6 +15,26 @@ namespace TNode.Editor.NodeViews{
         public DragBaseNodeView() : base(){
             this.titleContainer.visible = false;
            this.titleContainer.RemoveFromHierarchy();
+           this.OnDataChanged += OnDataChangedHandler;
+        }
+
+        private void OnDataChangedHandler(BlackboardDragNodeData obj){
+            var port = this.Q<Port>();
+            var label = port.Q<Label>();
+            var blackboard = obj.BlackboardData;
+            BlackboardDataWrapper blackboardWrapper = (BlackboardDataWrapper)blackboard;
+            var serializedData = new SerializedObject(blackboardWrapper);
+            var serializedProperty = serializedData.FindProperty("data").FindPropertyRelative(obj.blackDragData);
+            PropertyField field = new PropertyField(serializedProperty,"");
+            field.Bind(serializedData);
+            label.parent.parent.style.flexDirection = FlexDirection.RowReverse;
+            label.parent.parent.Add(field);
+            label.parent.parent.style.alignItems = Align.Center;
+            label.parent.parent.style.justifyContent = Justify.Center;
+            label.parent.parent.style.paddingTop = 0;
+            label.parent.parent.style.paddingBottom = 0;
+            label.RemoveFromHierarchy();
+            
         }
     }
 }
\ No newline at end of file
diff --git a/TNodeGraphViewImpl/Editor/NodeViews/NodeView.cs b/TNodeGraphViewImpl/Editor/NodeViews/NodeView.cs
index a3417da..c3bef2f 100644
--- a/TNodeGraphViewImpl/Editor/NodeViews/NodeView.cs
+++ b/TNodeGraphViewImpl/Editor/NodeViews/NodeView.cs
@@ -59,10 +59,7 @@ namespace TNodeGraphViewImpl.Editor.NodeViews{
             this.title = _data.nodeName;
             if (_nodeInspectorInNode != null){
                 _nodeInspectorInNode.Data = obj;
-                
-                
             }
-
             BuildInputAndOutputPort();
             this.expanded = true;
             this.RefreshExpandedState();
diff --git a/TNodeGraphViewImpl/Editor/Search/NodeSearchWindowProvider.cs b/TNodeGraphViewImpl/Editor/Search/NodeSearchWindowProvider.cs
index d7deafd..d2f2af7 100644
--- a/TNodeGraphViewImpl/Editor/Search/NodeSearchWindowProvider.cs
+++ b/TNodeGraphViewImpl/Editor/Search/NodeSearchWindowProvider.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using TNodeCore.Editor.NodeGraphView;
 using TNodeCore.Editor.Tools.NodeCreator;
 using TNodeCore.Models;
@@ -9,7 +10,7 @@ using UnityEditor.Experimental.GraphView;
 using UnityEngine;
 using UnityEngine.UIElements;
 
-namespace TNode.Editor.Search{
+namespace TNodeGraphViewImpl.Editor.Search{
     public class NodeSearchWindowProvider:ScriptableObject,ISearchWindowProvider{
         private Type _graphType;
         private GraphView _graphView;
@@ -21,20 +22,26 @@ namespace TNode.Editor.Search{
         }
         public List<SearchTreeEntry> CreateSearchTree(SearchWindowContext context){
             var nodeDataTypes = NodeEditorExtensions.GetGraphDataUsage(_graphType);
+            var categories = NodeEditorExtensions.GetGraphCategories(_graphType);
             
             var list = new List<SearchTreeEntry>{
-                new SearchTreeGroupEntry(new GUIContent("Add New Node"), 0),
+               
             };
-            //TODO a node icon shall be given by some way
+            var root = new SearchTreeGroupEntry(new GUIContent("Create"),0);
+            list.Add(root);
             Texture2D icon = new Texture2D(2,2);
-            foreach (var nodeDataType in nodeDataTypes){
-                Debug.Log(nodeDataType.Name);
-
-                
-                list.Add(new SearchTreeEntry(new GUIContent($" {nodeDataType.Name} ",icon)){
-                    level =  1,
-                    userData = nodeDataType,
+            foreach (var category in categories){
+                var categoryEntry = new SearchTreeGroupEntry(new GUIContent(category),1);
+                list.Add(categoryEntry);
+                nodeDataTypes.Where(x => NodeEditorExtensions.GetTypeCategory(x).Equals(category)).ToList().ForEach(x => {
+                    var nodeDataType = x;
+                    var nodeDataTypeEntry = new SearchTreeEntry(new GUIContent($" {nodeDataType.Name} ",icon)){
+                        level = 2,
+                        userData = nodeDataType
+                    };
+                    list.Add(nodeDataTypeEntry);
                 });
+
             }
             return list;
         }
@@ -55,8 +62,5 @@ namespace TNode.Editor.Search{
             }
             return false;
         }
-        
-        public NodeSearchWindowProvider(){
-        }
     }
 }
\ No newline at end of file