diff --git a/scripts/Config.cs b/scripts/Config.cs
index dfb3d06..1943972 100644
--- a/scripts/Config.cs
+++ b/scripts/Config.cs
@@ -170,12 +170,12 @@ public static class Config
     ///<para>在禁用版本隔离时用的</para>
     /// </remarks>
     public const string DefaultVersionName = "Default";
-    
+
     /// <summary>
     /// <para>EmptyVariant</para>
     /// <para>空变量</para>
     /// </summary>
-    public static readonly Variant EmptyVariant  = new();
+    public static readonly Variant EmptyVariant = new();
 
 
     /// <summary>
@@ -216,7 +216,7 @@ public static class Config
         /// </summary>
         public const string TimeInterval = "TimeInterval";
     }
-    
+
     /// <summary>
     /// <para>Item data changes the event type</para>
     /// <para>物品数据改变事件类型</para>
@@ -238,12 +238,17 @@ public static class Config
         /// <para>移除</para>
         /// </summary>
         Remove,
-        
+
         /// <summary>
         /// <para>Replace</para>
         /// <para>被替换</para>
         /// </summary>
-        Replace
+        Replace,
+        /// <summary>
+        /// <para>Clear</para>
+        /// <para>被清空</para>
+        /// </summary>
+        Clear
     }
 
     public enum OsEnum
diff --git a/scripts/inventory/HotBar.cs b/scripts/inventory/HotBar.cs
index 79bf7ea..3a041ff 100644
--- a/scripts/inventory/HotBar.cs
+++ b/scripts/inventory/HotBar.cs
@@ -15,10 +15,7 @@ public partial class HotBar : HBoxContainer
     public override void _Ready()
     {
         base._Ready();
-        var universalItemContainer = new UniversalItemContainer(Config.HotBarSize)
-        {
-            EnablePlaceholder = true
-        };
+        var universalItemContainer = new UniversalItemContainer(Config.HotBarSize);
         _itemContainer = universalItemContainer;
         _itemContainer.SupportSelect = true;
         _itemContainerDisplay = new ItemSlotContainerDisplay(this);
diff --git a/scripts/inventory/IItem.cs b/scripts/inventory/IItem.cs
index 783091a..d5f18af 100644
--- a/scripts/inventory/IItem.cs
+++ b/scripts/inventory/IItem.cs
@@ -4,6 +4,11 @@ namespace ColdMint.scripts.inventory;
 
 public interface IItem
 {
+    /// <summary>
+    /// <para>The position of the item in the container</para>
+    /// <para>物品在容器内的位置</para>
+    /// </summary>
+    public int Index { get; set; }
     /// <summary>
     /// <para>ID of current item</para>
     /// <para>当前物品的ID</para>
diff --git a/scripts/inventory/IItemContainer.cs b/scripts/inventory/IItemContainer.cs
index c06f23d..da46460 100644
--- a/scripts/inventory/IItemContainer.cs
+++ b/scripts/inventory/IItemContainer.cs
@@ -50,8 +50,12 @@ public interface IItemContainer
     /// <para>Gets a placeholder object</para>
     /// <para>获取占位符对象</para>
     /// </summary>
+    /// <param name="index">
+    ///<para>index</para>
+    ///<para>占位符代替的索引</para>
+    /// </param>
     /// <returns></returns>
-    IItem? GetPlaceHolderItem();
+    IItem GetPlaceHolderItem(int index);
 
     /// <summary>
     /// <para>Gets the selected location</para>
@@ -88,7 +92,13 @@ public interface IItemContainer
     /// <returns></returns>
     bool ReplaceItem(int index, IItem item);
 
-    bool ReplaceItem(IItem oldItem, IItem newItem);
+    /// <summary>
+    /// <para>ClearItem</para>
+    /// <para>清理物品</para>
+    /// </summary>
+    /// <param name="index"></param>
+    /// <returns></returns>
+    bool ClearItem(int index);
     
     /// <summary>
     /// <para>Gets the item in the specified location, equivalent to <see cref="GetItem"/></para>
@@ -128,14 +138,6 @@ public interface IItemContainer
     /// </returns>
     int RemoveItem(int itemIndex, int number);
 
-    /// <summary>
-    /// <para>Remove item</para>
-    /// <para>移除物品</para>
-    /// </summary>
-    /// <param name="item"></param>
-    /// <returns></returns>
-    int RemoveItem(IItem item, int number);
-
     /// <summary>
     /// <para>Gets the used capacity of the item container</para>
     /// <para>获取物品容器已使用的容量</para>
diff --git a/scripts/inventory/ItemContainerDisplayTemplate.cs b/scripts/inventory/ItemContainerDisplayTemplate.cs
index 40ac4e5..93a4050 100644
--- a/scripts/inventory/ItemContainerDisplayTemplate.cs
+++ b/scripts/inventory/ItemContainerDisplayTemplate.cs
@@ -118,12 +118,16 @@ public abstract class ItemContainerDisplayTemplate : IItemContainerDisplay
         var item = itemContainer.GetItem(index);
         if (item == null)
         {
-            item = itemContainer.GetPlaceHolderItem();
+            item = itemContainer.GetPlaceHolderItem(index);
         }
-        if (item != null)
+        if (itemContainer.SupportSelect)
         {
             item.IsSelect = index == itemContainer.GetSelectIndex();
         }
+        else
+        {
+            item.IsSelect = false;
+        }
         itemDisplay.Update(item);
         itemDisplay.ShowSelf();
     }
diff --git a/scripts/inventory/ItemSlotNode.cs b/scripts/inventory/ItemSlotNode.cs
index d413f85..0d81db8 100644
--- a/scripts/inventory/ItemSlotNode.cs
+++ b/scripts/inventory/ItemSlotNode.cs
@@ -78,6 +78,12 @@ public partial class ItemSlotNode : MarginContainer, IItemDisplay
 
     public override void _DropData(Vector2 atPosition, Variant data)
     {
+        //The item is empty and the corresponding item container cannot be retrieved.
+        //物品为空，无法获取对应的物品容器。
+        if (Item is null)
+        {
+            return;
+        }
         var type = data.VariantType;
         if (type == Variant.Type.Nil)
         {
@@ -89,10 +95,20 @@ public partial class ItemSlotNode : MarginContainer, IItemDisplay
         {
             return;
         }
-        if (Item is null || Item is PlaceholderItem)
+
+        if (Item is PlaceholderItem placeholderItem)
         {
-            sourceItem.ItemContainer?.RemoveItem(sourceItem, -1);
-            Item?.ItemContainer?.ReplaceItem(Item, sourceItem);
+            var placeholderItemContainer = placeholderItem.ItemContainer;
+            var sourceItemContainer = sourceItem.ItemContainer;
+            var sourceItemIndex = sourceItem.Index;
+            if (placeholderItemContainer != null)
+            {
+                placeholderItemContainer.ReplaceItem(placeholderItem.Index, sourceItem);
+            }
+            if (sourceItemContainer != null)
+            {
+                sourceItemContainer.ClearItem(sourceItemIndex);
+            }
         }
     }
 
diff --git a/scripts/inventory/Packsack.cs b/scripts/inventory/Packsack.cs
index c0729f5..5a351f0 100644
--- a/scripts/inventory/Packsack.cs
+++ b/scripts/inventory/Packsack.cs
@@ -35,18 +35,30 @@ public partial class Packsack : PickAbleTemplate
             if (control is PacksackUi packsackUi)
             {
                 packsackUi.Title = Name;
-                packsackUi.ItemContainer = ItemContainer;
+                packsackUi.ItemContainer = SelfItemContainer;
             }
         });
     }
 
-    public IItemContainer? ItemContainer { get; private set; }
+    public override void CopyAttributes(Node node)
+    {
+        base.CopyAttributes(node);
+        if (node is Packsack packsack)
+        {
+            SelfItemContainer = packsack.SelfItemContainer;
+        }
+    }
+
+    public IItemContainer? SelfItemContainer { get; set; }
 
     public override void _Ready()
     {
         base._Ready();
-        ItemContainer = new UniversalItemContainer(NumberSlots);
-        ItemContainer.SupportSelect = false;
+        if (SelfItemContainer == null)
+        {
+            SelfItemContainer = new UniversalItemContainer(NumberSlots);
+            SelfItemContainer.SupportSelect = false;
+        }
         GameSceneDepend.DynamicUiGroup?.RegisterControl(Path, () =>
         {
             var packedScene = GD.Load<PackedScene>(Path);
diff --git a/scripts/inventory/PlaceholderItem.cs b/scripts/inventory/PlaceholderItem.cs
index 6437dbd..7826eb4 100644
--- a/scripts/inventory/PlaceholderItem.cs
+++ b/scripts/inventory/PlaceholderItem.cs
@@ -8,6 +8,7 @@ namespace ColdMint.scripts.inventory;
 /// </summary>
 public class PlaceholderItem : IItem
 {
+    public int Index { get; set; }
     public string Id { get; set; }
     public Texture2D Icon { get; }
     public string Name { get; }
diff --git a/scripts/inventory/UniversalItemContainer.cs b/scripts/inventory/UniversalItemContainer.cs
index e38e95c..889f9fc 100644
--- a/scripts/inventory/UniversalItemContainer.cs
+++ b/scripts/inventory/UniversalItemContainer.cs
@@ -110,6 +110,7 @@ public class UniversalItemContainer(int totalCapacity) : IItemContainer
 
             var nextAvailableIndex = _nextAvailableIndex;
             _itemDictionary[nextAvailableIndex] = item;
+            item.Index = nextAvailableIndex;
             item.ItemContainer = this;
             UpdateNextAvailableIndex();
             UpdateSelectStatus(nextAvailableIndex, item);
@@ -169,6 +170,7 @@ public class UniversalItemContainer(int totalCapacity) : IItemContainer
         }
         var finalNextAvailableIndex = _nextAvailableIndex;
         _itemDictionary[finalNextAvailableIndex] = item;
+        item.Index = finalNextAvailableIndex;
         item.ItemContainer = this;
         UpdateNextAvailableIndex();
         UpdateSelectStatus(finalNextAvailableIndex, item);
@@ -182,11 +184,16 @@ public class UniversalItemContainer(int totalCapacity) : IItemContainer
     }
 
     public bool SupportSelect { get; set; }
-    public bool EnablePlaceholder { get; set; }
 
-    public IItem? GetPlaceHolderItem()
+
+    public IItem GetPlaceHolderItem(int index)
     {
-        return EnablePlaceholder ? new PlaceholderItem() : null;
+        var placeholderItem = new PlaceholderItem
+        {
+            Index = index,
+            ItemContainer = this
+        };
+        return placeholderItem;
     }
 
     public int GetSelectIndex()
@@ -208,6 +215,8 @@ public class UniversalItemContainer(int totalCapacity) : IItemContainer
     {
         var oldItem = GetItem(index);
         _itemDictionary[index] = item;
+        item.Index = index;
+        item.ItemContainer = this;
         ItemDataChangeEvent?.Invoke(new ItemDataChangeEvent
         {
             NewItem = item,
@@ -219,11 +228,24 @@ public class UniversalItemContainer(int totalCapacity) : IItemContainer
         return true;
     }
 
-    public bool ReplaceItem(IItem oldItem, IItem newItem)
+
+    public bool ClearItem(int index)
     {
-        var index = GetIndexByItem(oldItem);
-        return index != UnknownIndex && ReplaceItem(index, newItem);
+        var result = _itemDictionary.Remove(index);
+        if (result)
+        {
+            ItemDataChangeEvent?.Invoke(new ItemDataChangeEvent
+            {
+                NewItem = null,
+                NewIndex = index,
+                OldIndex = index,
+                OldItem = null,
+                Type = Config.ItemDataChangeEventType.Clear
+            });
+        }
+        return result;
     }
+    
 
     public int RemoveSelectItem(int number)
     {
@@ -276,37 +298,6 @@ public class UniversalItemContainer(int totalCapacity) : IItemContainer
         return removed;
     }
 
-    public int RemoveItem(IItem item, int number)
-    {
-        var index = GetIndexByItem(item);
-        return index == UnknownIndex ? 0 : RemoveItem(index, number);
-    }
-
-
-    /// <summary>
-    /// <para>Find the corresponding index based on the item object</para>
-    /// <para>根据物品对象查找对应的索引</para>
-    /// </summary>
-    /// <param name="item"></param>
-    /// <returns></returns>
-    private int GetIndexByItem(IItem item)
-    {
-        if (totalCapacity <= 0)
-        {
-            return UnknownIndex;
-        }
-        for (var i = 0; i < totalCapacity; i++)
-        {
-            var contains = _itemDictionary.ContainsKey(i);
-            if (!contains) continue;
-            if (item == _itemDictionary[i])
-            {
-                return i;
-            }
-        }
-        return UnknownIndex;
-    }
-
     public int GetUsedCapacity()
     {
         return _itemDictionary.Count;
diff --git a/scripts/pickable/PickAbleTemplate.cs b/scripts/pickable/PickAbleTemplate.cs
index f1a9985..d70a31a 100644
--- a/scripts/pickable/PickAbleTemplate.cs
+++ b/scripts/pickable/PickAbleTemplate.cs
@@ -15,6 +15,7 @@ namespace ColdMint.scripts.pickable;
 /// </summary>
 public partial class PickAbleTemplate : RigidBody2D, IItem
 {
+    public int Index { get; set; }
     //Do not export this field because the ID is specified within yaml.
     //不要导出此字段，因为ID是在yaml内指定的。
     public virtual string Id { get; set; } = "ID";
@@ -292,7 +293,7 @@ public partial class PickAbleTemplate : RigidBody2D, IItem
     /// <para>请在此函数内复制节点属性</para>
     /// </summary>
     /// <param name="node"></param>
-    public void CopyAttributes(Node node)
+    public virtual void CopyAttributes(Node node)
     {
         if (node is not PickAbleTemplate pickAbleTemplate)
         {