diff --git a/Unity/Demos/Assets/DragonBones/Scripts/unity/UnityArmatureComponent.cs b/Unity/Demos/Assets/DragonBones/Scripts/unity/UnityArmatureComponent.cs
index 69f2ac0..924bbf1 100644
--- a/Unity/Demos/Assets/DragonBones/Scripts/unity/UnityArmatureComponent.cs
+++ b/Unity/Demos/Assets/DragonBones/Scripts/unity/UnityArmatureComponent.cs
@@ -147,8 +147,6 @@ public class UnityArmatureComponent : DragonBoneEventDispatcher, IArmatureProxy
         [SerializeField]
         protected bool _flipY = false;
 
-        private List<Slot> _sortedSlots = null;
-
         private bool _hasSortingGroup = false;
         /// <private/>
         public void DBClear()
@@ -182,7 +180,6 @@ public void DBClear()
             _zSpace = 0.0f;
             _flipX = false;
             _flipY = false;
-            _sortedSlots = null;
 
             _hasSortingGroup = false;
         }
@@ -620,7 +617,6 @@ void OnDestroy()
             }
 
             unityBones = null;
-            _sortedSlots = null;
             _disposeProxy = true;
             _armature = null;
         }