diff --git a/locals/Log.csv b/locals/Log.csv
index 60dffeb..f0ca0bd 100644
--- a/locals/Log.csv
+++ b/locals/Log.csv
@@ -36,4 +36,5 @@ log_found_files,找到{0}个文件,Found {0} files,{0}ファイルが見つか
 log_found_item_types,从文件中找到{0}个物品类型,Found {0} item types in files,ファイルから{0}個のアイテム・タイプが見つかった
 log_register_item,注册物品类型{0}结果为{1},Registered item type {0}; results in {1},登録されたアイテム・タイプ {0} の結果は {1} です。
 log_error_when_open_item_regs_dir,尝试打开物品信息目录时发生错误,Error when opening itemRegs dir,アイテム情報カタログを開こうとしてエラーが発生しました。
-log_wrong_custom_arg,不匹配的参数：类型为{0}而值为{1},Mismatched parameter: type {0} and value {1},パラメータの不一致：型{0}と値{1}。
\ No newline at end of file
+log_wrong_custom_arg,不匹配的参数：类型为{0}而值为{1},Mismatched parameter: type {0} and value {1},パラメータの不一致：型{0}と値{1}。
+log_item_container_is_null,物品容器为空,Item container is null,アイテム・コンテナが空です
\ No newline at end of file
diff --git a/scripts/character/CharacterTemplate.cs b/scripts/character/CharacterTemplate.cs
index 90c5c6e..30c19a2 100644
--- a/scripts/character/CharacterTemplate.cs
+++ b/scripts/character/CharacterTemplate.cs
@@ -7,7 +7,6 @@ using ColdMint.scripts.debug;
 using ColdMint.scripts.health;
 using ColdMint.scripts.inventory;
 using ColdMint.scripts.item;
-using ColdMint.scripts.item.itemStacks;
 using ColdMint.scripts.utils;
 using ColdMint.scripts.item.weapon;
 using ColdMint.scripts.loot;
@@ -40,9 +39,20 @@ public partial class CharacterTemplate : CharacterBody2D
 
     protected string? CharacterName;
 
+    protected IItemContainer? ProtectedItemContainer;
+
     //Item containers are used to store items.
     //物品容器用于存储物品。
-    public IItemContainer? ItemContainer { get; set; }
+    public IItemContainer? ItemContainer
+    {
+        get => ProtectedItemContainer;
+        set
+        {
+            ProtectedItemContainer = value;
+            WhenBindItemContainer(ProtectedItemContainer);
+        }
+    }
+
 
     //Items currently held
     //当前持有的物品
@@ -58,6 +68,16 @@ public partial class CharacterTemplate : CharacterBody2D
         }
     }
 
+    /// <summary>
+    /// <para>When binding an item container to a character</para>
+    /// <para>当为角色绑定物品容器时</para>
+    /// </summary>
+    /// <param name="itemContainer"></param>
+    protected virtual void WhenBindItemContainer(IItemContainer? itemContainer)
+    {
+    }
+
+
     /// <summary>
     /// <para>When the items the character holds are updated</para>
     /// <para>当角色持有的物品更新时</para>
@@ -618,7 +638,6 @@ public partial class CharacterTemplate : CharacterBody2D
     {
         var itemSlotNode = ItemContainer?.GetItemSlotNode(index);
         if (itemSlotNode is null) return;
-
         if (number < 0)
         {
             while (!itemSlotNode.IsEmpty())
diff --git a/scripts/character/Player.cs b/scripts/character/Player.cs
index f618a05..edcf35a 100644
--- a/scripts/character/Player.cs
+++ b/scripts/character/Player.cs
@@ -1,9 +1,9 @@
 using System;
 using System.Text;
 using System.Threading.Tasks;
-
 using ColdMint.scripts.damage;
 using ColdMint.scripts.deathInfo;
+using ColdMint.scripts.inventory;
 using ColdMint.scripts.item;
 using ColdMint.scripts.map.events;
 using ColdMint.scripts.utils;
@@ -62,6 +62,43 @@ public partial class Player : CharacterTemplate
         }
     }
 
+    protected override void WhenBindItemContainer(IItemContainer? itemContainer)
+    {
+        if (itemContainer == null)
+        {
+            return;
+        }
+
+        //Subscribe to events when the item container is bound to the player.
+        //在物品容器与玩家绑定时订阅事件。
+        itemContainer.SelectedItemSlotChangeEvent += SelectedItemSlotChangeEvent;
+    }
+
+    public override void _ExitTree()
+    {
+        base._ExitTree();
+        if (ProtectedItemContainer != null)
+        {
+            //Unsubscribe to events when this object is destroyed.
+            //此节点被销毁时，取消订阅事件。
+            ProtectedItemContainer.SelectedItemSlotChangeEvent -= SelectedItemSlotChangeEvent;
+        }
+    }
+
+    private void SelectedItemSlotChangeEvent(SelectedItemSlotChangeEvent selectedItemSlotChangeEvent)
+    {
+        var item = selectedItemSlotChangeEvent.NewItemSlotNode?.GetItemStack()?.GetItem();
+        GameSceneNodeHolder.HideBackpackUiContainerIfVisible();
+        if (item is Node2D node2D)
+        {
+            CurrentItem = node2D;
+        }
+        else
+        {
+            CurrentItem = null;
+        }
+    }
+
     /// <summary>
     /// <para>Update operation prompt</para>
     /// <para>更新操作提示</para>
@@ -103,7 +140,7 @@ public partial class Player : CharacterTemplate
             operationTipBuilder.Append(Config.OperationTipActionColor);
             operationTipBuilder.Append(']');
             operationTipBuilder.Append(
-                                       TranslationServerUtils.Translate(InputMap.ActionGetEvents("ui_down")[0].AsText()));
+                TranslationServerUtils.Translate(InputMap.ActionGetEvents("ui_down")[0].AsText()));
             operationTipBuilder.Append("[/color]");
             operationTipBuilder.Append(TranslationServerUtils.Translate("action_jump_down"));
         }
@@ -117,7 +154,7 @@ public partial class Player : CharacterTemplate
             operationTipBuilder.Append(Config.OperationTipActionColor);
             operationTipBuilder.Append(']');
             operationTipBuilder.Append(
-                                       TranslationServerUtils.Translate(InputMap.ActionGetEvents("pick_up")[0].AsText()));
+                TranslationServerUtils.Translate(InputMap.ActionGetEvents("pick_up")[0].AsText()));
             operationTipBuilder.Append("[/color]");
             operationTipBuilder.Append(TranslationServerUtils.Translate("action_pick_up"));
             operationTipLabel.Text = operationTipBuilder.ToString();
@@ -140,7 +177,7 @@ public partial class Player : CharacterTemplate
                 operationTipBuilder.Append(Config.OperationTipActionColor);
                 operationTipBuilder.Append(']');
                 operationTipBuilder.Append(
-                                           TranslationServerUtils.Translate(InputMap.ActionGetEvents("use_item")[0].AsText()));
+                    TranslationServerUtils.Translate(InputMap.ActionGetEvents("use_item")[0].AsText()));
                 operationTipBuilder.Append("[/color]");
                 operationTipBuilder.Append(TranslationServerUtils.Translate("action_use_item"));
                 operationTipBuilder.Append(TranslationServerUtils.Translate(item.Name));
@@ -244,8 +281,8 @@ public partial class Player : CharacterTemplate
             }
 
             _parabola.Points = CurrentItem == null
-                                   ? _emptyVector2Array
-                                   : ParabolicUtils.ComputeParabolic(ItemMarker2D.Position, GetThrowVelocity(), Gravity, 0.1f);
+                ? _emptyVector2Array
+                : ParabolicUtils.ComputeParabolic(ItemMarker2D.Position, GetThrowVelocity(), Gravity, 0.1f);
         }
 
 
@@ -403,9 +440,9 @@ public partial class Player : CharacterTemplate
             {
                 var rotationDegreesNode2D = node2D.RotationDegrees;
                 var rotationDegreesNode2DAbs = Math.Abs(rotationDegreesNode2D);
-                _floatLabel.Position = rotationDegreesNode2DAbs > 90 
-                                           ? new Vector2(0, PromptTextDistance)
-                                           : new Vector2(0, -PromptTextDistance);
+                _floatLabel.Position = rotationDegreesNode2DAbs > 90
+                    ? new Vector2(0, PromptTextDistance)
+                    : new Vector2(0, -PromptTextDistance);
                 _floatLabel.RotationDegrees = 0 - rotationDegreesNode2D;
                 var label = _floatLabel.GetNode<Label>("Label");
                 if (node is PickAbleTemplate pickAbleTemplate)
diff --git a/scripts/inventory/HotBar.cs b/scripts/inventory/HotBar.cs
index 98fa97f..20c7464 100644
--- a/scripts/inventory/HotBar.cs
+++ b/scripts/inventory/HotBar.cs
@@ -1,3 +1,4 @@
+using System;
 using ColdMint.scripts.map.events;
 using ColdMint.scripts.utils;
 using Godot;
@@ -11,12 +12,14 @@ namespace ColdMint.scripts.inventory;
 public partial class HotBar : HBoxContainer
 {
     private IItemContainer? _itemContainer;
+    
+    Action<SelectedItemSlotChangeEvent>? SelectedItemSlotChangeEvent { get; set; }
 
     public override void _Ready()
     {
         base._Ready();
         _itemContainer = new UniversalItemContainer();
-        EventManager.PlayerInstanceChangeEvent += PlayerInstanceChangeEvent;
+        _itemContainer.SelectedItemSlotChangeEvent += SelectedItemSlotChangeEvent;
         NodeUtils.DeleteAllChild(this);
         for (var i = 0; i < Config.HotBarSize; i++)
         {
@@ -25,19 +28,6 @@ public partial class HotBar : HBoxContainer
     }
 
 
-    /// <summary>
-    /// <para>When the player instance changes, we update the binding of the item container</para>
-    /// <para>当玩家实例改变时，我们更新物品容器的绑定</para>
-    /// </summary>
-    /// <param name="playerInstanceChangeEvent"></param>
-    private void PlayerInstanceChangeEvent(PlayerInstanceChangeEvent playerInstanceChangeEvent)
-    {
-        if (_itemContainer is UniversalItemContainer universalItemContainer)
-        {
-            universalItemContainer.CharacterTemplate = GameSceneNodeHolder.Player;
-        }
-    }
-
     public override void _Process(double delta)
     {
         base._Process(delta);
@@ -45,7 +35,6 @@ public partial class HotBar : HBoxContainer
         {
             //Mouse wheel down
             //鼠标滚轮向下
-            GameSceneNodeHolder.HideBackpackUiContainerIfVisible();
             _itemContainer?.SelectTheNextItemSlot();
         }
 
@@ -53,7 +42,6 @@ public partial class HotBar : HBoxContainer
         {
             //Mouse wheel up
             //鼠标滚轮向上
-            GameSceneNodeHolder.HideBackpackUiContainerIfVisible();
             _itemContainer?.SelectThePreviousItemSlot();
         }
 
@@ -112,11 +100,11 @@ public partial class HotBar : HBoxContainer
     /// <param name="shortcutKeyIndex"></param>
     private void SelectItemSlotByHotBarShortcutKey(int shortcutKeyIndex)
     {
-        GameSceneNodeHolder.HideBackpackUiContainerIfVisible();
         if (_itemContainer == null)
         {
             return;
         }
+
         _itemContainer.SelectItemSlot(shortcutKeyIndex);
     }
 
@@ -128,6 +116,9 @@ public partial class HotBar : HBoxContainer
     public override void _ExitTree()
     {
         base._ExitTree();
-        EventManager.PlayerInstanceChangeEvent -= PlayerInstanceChangeEvent;
+        if (_itemContainer != null)
+        {
+            _itemContainer.SelectedItemSlotChangeEvent -= SelectedItemSlotChangeEvent;
+        }
     }
 }
\ No newline at end of file
diff --git a/scripts/inventory/IItemContainer.cs b/scripts/inventory/IItemContainer.cs
index b9a3345..5e45ddd 100644
--- a/scripts/inventory/IItemContainer.cs
+++ b/scripts/inventory/IItemContainer.cs
@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using ColdMint.scripts.item;
 using ColdMint.scripts.item.itemStacks;
+using ColdMint.scripts.map.events;
 using Godot;
 
 namespace ColdMint.scripts.inventory;
@@ -16,6 +17,12 @@ namespace ColdMint.scripts.inventory;
 /// </remarks>
 public interface IItemContainer : IEnumerable<ItemSlotNode>
 {
+    /// <summary>
+    /// <para>This event is triggered when the selected item slot changes</para>
+    /// <para>当选中的物品槽改变时，触发此事件</para>
+    /// </summary>
+    Action<SelectedItemSlotChangeEvent>? SelectedItemSlotChangeEvent { get; set; }
+
     /// <summary>
     /// <para>Can the specified item be added to the container?</para>
     /// <para>指定的物品是否可添加到容器内？</para>
@@ -31,12 +38,12 @@ public interface IItemContainer : IEnumerable<ItemSlotNode>
     /// <param name="item"></param>
     /// <returns></returns>
     bool AddItem(IItem item);
-    
+
     /// <summary>
     /// <para>Whether this item container supports checking</para>
     /// <para>此物品容器是否支持选中</para>
     /// </summary>
-    public bool SupportSelect { get; set; } 
+    public bool SupportSelect { get; set; }
 
     /// <summary>
     /// <para>Determines the number of items that can be received from the specified pile</para>
diff --git a/scripts/inventory/UniversalItemContainer.cs b/scripts/inventory/UniversalItemContainer.cs
index c6e5162..d55d020 100644
--- a/scripts/inventory/UniversalItemContainer.cs
+++ b/scripts/inventory/UniversalItemContainer.cs
@@ -2,9 +2,9 @@
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
-using ColdMint.scripts.character;
 using ColdMint.scripts.item;
 using ColdMint.scripts.item.itemStacks;
+using ColdMint.scripts.map.events;
 using ColdMint.scripts.utils;
 using Godot;
 using JetBrains.Annotations;
@@ -21,11 +21,6 @@ public class UniversalItemContainer : IItemContainer
 
     private readonly List<ItemSlotNode>? _itemSlotNodes = [];
 
-    /// <summary>
-    /// <para>Character</para>
-    /// <para>角色</para>
-    /// </summary>
-    public CharacterTemplate? CharacterTemplate { get; set; }
 
     /// <summary>
     /// <para>UnknownIndex</para>
@@ -39,6 +34,8 @@ public class UniversalItemContainer : IItemContainer
 
     public bool SupportSelect { get; set; } = true;
 
+    public Action<SelectedItemSlotChangeEvent>? SelectedItemSlotChangeEvent { get; set; }
+
     public bool CanAddItem(IItem item)
     {
         return Match(item) != null;
@@ -274,32 +271,6 @@ public class UniversalItemContainer : IItemContainer
         }
 
         _itemSlotNodes.Add(itemSlotNode);
-        // itemSlotNode.ItemStackChangeEvent += @event =>
-        // {
-        //     if (_itemSlotNodes == null)
-        //     {
-        //         return;
-        //     }
-        //
-        //     var index = _itemSlotNodes.IndexOf(itemSlotNode);
-        //     // LogCat.Log("位于" + index + "的堆改变了。" + _selectIndex + "空的吗" + (@event.ItemStack == null));
-        //     if (index == -1)
-        //     {
-        //         return;
-        //     }
-        //
-        //     if (index == _selectIndex)
-        //     {
-        //         if (@event.ItemStack == null)
-        //         {
-        //             HideItem(index);
-        //         }
-        //         else
-        //         {
-        //             DisplayItem(index);
-        //         }
-        //     }
-        // };
         return itemSlotNode;
     }
 
@@ -371,25 +342,22 @@ public class UniversalItemContainer : IItemContainer
     /// </summary>
     private void PrivateSelectItemSlot(int oldSelectIndex, int newSelectIndex)
     {
-        if (!SupportSelect)
+        if (!SupportSelect || _itemSlotNodes == null || oldSelectIndex == newSelectIndex)
         {
             return;
         }
 
-        if (oldSelectIndex == newSelectIndex)
-        {
-            return;
-        }
-
-        if (_itemSlotNodes == null)
-        {
-            return;
-        }
-
-        _itemSlotNodes[oldSelectIndex].IsSelect = false;
-        _itemSlotNodes[newSelectIndex].IsSelect = true;
+        var oldItemSlotNode = _itemSlotNodes[oldSelectIndex];
+        oldItemSlotNode.IsSelect = false;
+        var newItemSlotNode = _itemSlotNodes[newSelectIndex];
+        newItemSlotNode.IsSelect = true;
         HideItem(oldSelectIndex);
         DisplayItem(newSelectIndex);
+        SelectedItemSlotChangeEvent?.Invoke(new SelectedItemSlotChangeEvent
+        {
+            NewItemSlotNode = newItemSlotNode,
+            OldItemSlotNode = oldItemSlotNode
+        });
         _selectIndex = newSelectIndex;
     }
 
@@ -400,17 +368,10 @@ public class UniversalItemContainer : IItemContainer
     /// <param name="index"></param>
     private void HideItem(int index)
     {
-        if (_itemSlotNodes == null)
-        {
-            return;
-        }
-
-        var oldItem = _itemSlotNodes[index].GetItemStack()?.GetItem();
-        if (oldItem is Node2D oldNode2D)
-        {
-            oldNode2D.ProcessMode = Node.ProcessModeEnum.Disabled;
-            oldNode2D.Hide();
-        }
+        var oldItem = _itemSlotNodes?[index].GetItemStack()?.GetItem();
+        if (oldItem is not Node2D oldNode2D) return;
+        oldNode2D.ProcessMode = Node.ProcessModeEnum.Disabled;
+        oldNode2D.Hide();
     }
 
     /// <summary>
@@ -424,44 +385,10 @@ public class UniversalItemContainer : IItemContainer
     /// <param name="index"></param>
     private void DisplayItem(int index)
     {
-        if (_itemSlotNodes == null)
-        {
-            return;
-        }
-
-        var item = _itemSlotNodes[index].GetItemStack()?.GetItem();
-        switch (item)
-        {
-            case null:
-            {
-                if (CharacterTemplate != null)
-                {
-                    CharacterTemplate.CurrentItem = null;
-                }
-
-                break;
-            }
-            case Node2D node2D:
-            {
-                node2D.ProcessMode = Node.ProcessModeEnum.Inherit;
-                node2D.Show();
-                if (CharacterTemplate != null)
-                {
-                    CharacterTemplate.CurrentItem = node2D;
-                }
-
-                break;
-            }
-            default:
-            {
-                if (CharacterTemplate != null)
-                {
-                    CharacterTemplate.CurrentItem = null;
-                }
-
-                break;
-            }
-        }
+        var item = _itemSlotNodes?[index].GetItemStack()?.GetItem();
+        if (item is not Node2D newNode2D) return;
+        newNode2D.ProcessMode = Node.ProcessModeEnum.Inherit;
+        newNode2D.Show();
     }
 
 
diff --git a/scripts/map/PlayerSpawn.cs b/scripts/map/PlayerSpawn.cs
index de6f76f..a32fe44 100644
--- a/scripts/map/PlayerSpawn.cs
+++ b/scripts/map/PlayerSpawn.cs
@@ -1,4 +1,5 @@
-using ColdMint.scripts.character;
+using System;
+using ColdMint.scripts.character;
 using ColdMint.scripts.debug;
 using ColdMint.scripts.map.events;
 using ColdMint.scripts.utils;
@@ -58,7 +59,16 @@ public partial class PlayerSpawn : Marker2D
         {
             return;
         }
-        playerNode.ItemContainer = GameSceneNodeHolder.HotBar?.GetItemContainer();
+
+        var itemContainer = GameSceneNodeHolder.HotBar?.GetItemContainer();
+        if (itemContainer == null)
+        {
+            //Throws an exception when the item container is empty.
+            //当物品容器为空时，抛出异常。
+            throw new NullReferenceException(TranslationServerUtils.Translate("log_item_container_is_null"));
+        }
+
+        playerNode.ItemContainer = itemContainer;
         GameSceneNodeHolder.Player = playerNode;
         playerNode.Position = GlobalPosition;
         LogCat.LogWithFormat("player_spawn_debug", playerNode.ReadOnlyCharacterName, playerNode.Position);
diff --git a/scripts/map/events/SelectedItemSlotChangeEvent.cs b/scripts/map/events/SelectedItemSlotChangeEvent.cs
new file mode 100644
index 0000000..00514e9
--- /dev/null
+++ b/scripts/map/events/SelectedItemSlotChangeEvent.cs
@@ -0,0 +1,22 @@
+using ColdMint.scripts.inventory;
+
+namespace ColdMint.scripts.map.events;
+
+/// <summary>
+/// <para>Selected item slot changes event</para>
+/// <para>选中的物品槽改变事件</para>
+/// </summary>
+public class SelectedItemSlotChangeEvent
+{
+    /// <summary>
+    /// <para></para>
+    /// <para>新选中的物品槽</para>
+    /// </summary>
+    public ItemSlotNode? NewItemSlotNode { get; set; }
+    
+    /// <summary>
+    /// <para>Lost the selected item slot</para>
+    /// <para>失去选中的物品槽</para>
+    /// </summary>
+    public ItemSlotNode? OldItemSlotNode { get; set; }
+}
\ No newline at end of file