diff --git a/Assets/SimpleSpriteSelect/Demo/SpriteDragTest/SpriteListBehaviour.prefab b/Assets/SimpleSpriteSelect/Demo/SpriteDragTest/SpriteListBehaviour.prefab
index 90369bb..99c82ef 100644
--- a/Assets/SimpleSpriteSelect/Demo/SpriteDragTest/SpriteListBehaviour.prefab
+++ b/Assets/SimpleSpriteSelect/Demo/SpriteDragTest/SpriteListBehaviour.prefab
@@ -44,4 +44,15 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 9550a5ec5f2fd3e44bf3f388657ceac2, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  spriteList: []
+  spriteList:
+  - {fileID: -1818584816, guid: fdebc19e2d432a64ab02fa13fe431100, type: 3}
+  - {fileID: -2061715535, guid: fdebc19e2d432a64ab02fa13fe431100, type: 3}
+  - {fileID: -1004022116, guid: fdebc19e2d432a64ab02fa13fe431100, type: 3}
+  - {fileID: 109263268, guid: fdebc19e2d432a64ab02fa13fe431100, type: 3}
+  - {fileID: 829465713, guid: fdebc19e2d432a64ab02fa13fe431100, type: 3}
+  - {fileID: -212670014, guid: fdebc19e2d432a64ab02fa13fe431100, type: 3}
+  - {fileID: -776789061, guid: fdebc19e2d432a64ab02fa13fe431100, type: 3}
+  - {fileID: 979163657, guid: fdebc19e2d432a64ab02fa13fe431100, type: 3}
+  - {fileID: -444935751, guid: fdebc19e2d432a64ab02fa13fe431100, type: 3}
+  - {fileID: 1822210353, guid: fdebc19e2d432a64ab02fa13fe431100, type: 3}
+  - {fileID: 85206195, guid: fdebc19e2d432a64ab02fa13fe431100, type: 3}
diff --git a/Assets/SimpleSpriteSelect/Editor/Normal/SpriteEditorSelectModuleNormal.cs b/Assets/SimpleSpriteSelect/Editor/Normal/SpriteEditorSelectModuleNormal.cs
index f7cbd8e..aa1fe57 100644
--- a/Assets/SimpleSpriteSelect/Editor/Normal/SpriteEditorSelectModuleNormal.cs
+++ b/Assets/SimpleSpriteSelect/Editor/Normal/SpriteEditorSelectModuleNormal.cs
@@ -35,6 +35,11 @@ private void DragAndDropAllSelectionSpriteList()
         {
             return;
         }
+
+        if (isSingleSpriteDragAndDrop)
+        {
+            return;
+        }
         
         // check left mouse down
         if (!Event.current.isMouse || Event.current.button != 0 || Event.current.type != EventType.MouseDown)
diff --git a/Assets/SimpleSpriteSelect/Editor/SpriteEditorSelectModuleBase.cs b/Assets/SimpleSpriteSelect/Editor/SpriteEditorSelectModuleBase.cs
index 0d1bb50..c81c1c9 100644
--- a/Assets/SimpleSpriteSelect/Editor/SpriteEditorSelectModuleBase.cs
+++ b/Assets/SimpleSpriteSelect/Editor/SpriteEditorSelectModuleBase.cs
@@ -28,9 +28,10 @@ public abstract class SpriteEditorSelectModuleBase : SpriteEditorModuleBase
 
     
     protected List<SpriteRect> selectionSpriteRectList = new();
-    
-    
-    private bool isSingleSpriteDragAndDrop = false;
+
+
+    protected bool isSingleSpriteDragAndDrop { get; private set; }
+
     
     
     
diff --git a/Assets/SimpleSpriteSelect/Editor/Utils/SerializedObjectExtra/SerializedObjectHelperUtils.cs b/Assets/SimpleSpriteSelect/Editor/Utils/SerializedObjectExtra/SerializedObjectHelperUtils.cs
index 962afec..687f8df 100644
--- a/Assets/SimpleSpriteSelect/Editor/Utils/SerializedObjectExtra/SerializedObjectHelperUtils.cs
+++ b/Assets/SimpleSpriteSelect/Editor/Utils/SerializedObjectExtra/SerializedObjectHelperUtils.cs
@@ -15,6 +15,17 @@ public static void GetAllDependAssets<T>(Object obj, List<T> resultList)
 
         findedHashSet.Clear();
         
+        GetAllDependAssetsStart(obj, resultList);
+        
+    }
+    
+    
+    
+    private static void GetAllDependAssetsStart<T>(Object obj, List<T> resultList)
+        where T : Object
+    {
+
+        
         switch (obj)
         {
             case GameObject gameObject:
@@ -55,7 +66,7 @@ private static void GetAllDependAssetsInternal<T>(GameObject gameObject, List<T>
             }
 
 
-            GetAllDependAssets(component, resultList);
+            GetAllDependAssetsStart(component, resultList);
 
         }
         
@@ -66,6 +77,12 @@ private static void GetAllDependAssetsInternal<T>(Object obj, List<T> resultList
         where T : Object
     {
        
+        // check finded
+        if (!findedHashSet.Add(obj))
+        {
+            return;
+        }
+        
         var serializedObject = new SerializedObject(obj);
         
         
@@ -93,7 +110,7 @@ private static void GetAllDependAssetsInternal<T>(Object obj, List<T> resultList
                 }
                 else
                 {
-                    GetAllDependAssets(property.objectReferenceValue, resultList);
+                    GetAllDependAssetsStart(property.objectReferenceValue, resultList);
                 }
             }
         }