diff --git a/scripts/character/CharacterTemplate.cs b/scripts/character/CharacterTemplate.cs
index 8494134..4422ab2 100644
--- a/scripts/character/CharacterTemplate.cs
+++ b/scripts/character/CharacterTemplate.cs
@@ -41,14 +41,7 @@ public partial class CharacterTemplate : CharacterBody2D
 
     //Item containers are used to store items.
     //物品容器用于存储物品。
-    private IItemContainer? _itemContainer;
-
-
-    public IItemContainer? ItemContainer
-    {
-        get => _itemContainer;
-        set => _itemContainer = value;
-    }
+    public IItemContainer? ItemContainer { get; set; }
 
     //Items currently held
     //当前持有的物品
@@ -282,14 +275,14 @@ public partial class CharacterTemplate : CharacterBody2D
             return false;
         }
 
-        if (_itemContainer == null)
+        if (ItemContainer == null)
         {
             return false;
         }
 
         //Get the currently selected node
         //拿到当前选择的节点
-        var itemSlotNode = _itemContainer.GetSelectItemSlotNode();
+        var itemSlotNode = ItemContainer.GetSelectItemSlotNode();
         if (itemSlotNode == null)
         {
             return false;
@@ -297,7 +290,7 @@ public partial class CharacterTemplate : CharacterBody2D
 
         //First check if we can pick up the item.
         //先检查我们能否拾起此物品。
-        var canPick = _itemContainer.CanAddItem(item);
+        var canPick = ItemContainer.CanAddItem(item);
         if (!canPick)
         {
             return false;
@@ -305,7 +298,7 @@ public partial class CharacterTemplate : CharacterBody2D
 
         //Is it successfully added to the container?
         //再检查是否成功的添加到容器内了？
-        var addSuccess = _itemContainer.AddItem(item);
+        var addSuccess = ItemContainer.AddItem(item);
         if (!addSuccess)
         {
             return false;
@@ -504,7 +497,7 @@ public partial class CharacterTemplate : CharacterBody2D
     /// <param name="node"></param>
     protected virtual void EnterThePickingRangeBody(Node node)
     {
-        if (node is not IItem)
+        if (node is not IItem_New item)
         {
             return;
         }
@@ -519,7 +512,7 @@ public partial class CharacterTemplate : CharacterBody2D
     /// <param name="node"></param>
     protected virtual void ExitThePickingRangeBody(Node node)
     {
-        if (node is not IItem)
+        if (node is not IItem_New)
         {
             return;
         }
@@ -549,12 +542,12 @@ public partial class CharacterTemplate : CharacterBody2D
     {
         //If the item container is null, then return
         //如果物品容器为null，那么返回
-        if (_itemContainer == null)
+        if (ItemContainer == null)
         {
             return;
         }
 
-        var len = _itemContainer.GetItemSlotCount();
+        var len = ItemContainer.GetItemSlotCount();
         if (len == 0)
         {
             return;
@@ -599,7 +592,7 @@ public partial class CharacterTemplate : CharacterBody2D
     /// </param>
     protected void ThrowItem(int index, int number, Vector2 velocity)
     {
-        var itemSlotNode = _itemContainer?.GetItemSlotNode(index);
+        var itemSlotNode = ItemContainer?.GetItemSlotNode(index);
 
         var item = itemSlotNode?.GetItem();
 
diff --git a/scripts/inventory/HotBar.cs b/scripts/inventory/HotBar.cs
index 4fb129a..f9dda26 100644
--- a/scripts/inventory/HotBar.cs
+++ b/scripts/inventory/HotBar.cs
@@ -339,7 +339,7 @@ public partial class HotBar : HBoxContainer, IItemContainer
         {
             return false;
         }
-        return itemSlotNode.SetItem(item);
+        return itemSlotNode.ReplaceItemStack(item);
     }
 
     public int GetSelectIndex()
@@ -374,7 +374,7 @@ public partial class HotBar : HBoxContainer, IItemContainer
 
         foreach (var itemSlotNode in _itemSlotNodes)
         {
-            if (itemSlotNode.CanSetItem(item))
+            if (itemSlotNode.CanAddItem(item))
             {
                 //If there is an item slot to put this item in, then we return it.
                 //如果有物品槽可放置此物品，那么我们返回它。
diff --git a/scripts/inventory/ItemSlotNode.cs b/scripts/inventory/ItemSlotNode.cs
index 93a07f5..ea526a6 100644
--- a/scripts/inventory/ItemSlotNode.cs
+++ b/scripts/inventory/ItemSlotNode.cs
@@ -42,7 +42,49 @@ public partial class ItemSlotNode : MarginContainer
     /// <para>获取物品槽内的物品堆</para>
     /// </summary>
     /// <returns></returns>
-    public IItemStack GetItemStack() => _itemStack;
+    public IItemStack? GetItemStack() => _itemStack;
+
+    /// <summary>
+    /// <para>If present, get the item at the top of the item stack in this slot</para>
+    /// <para>如果存在，获取该槽位中物品堆顶部的物品</para>
+    /// </summary>
+    public IItem_New? GetItem() => _itemStack?.GetItem();
+
+    /// <summary>
+    /// <para>If present, remove an item in this slot and return it.</para>
+    /// <para>如果存在，移除该槽位中的一个物品并将其返回</para>
+    /// </summary>
+    /// <seealso cref="PickItems"/>
+    public IItem_New? PickItem()
+    {
+        if (_itemStack is null) return null;
+
+        var result = _itemStack.PickItem();
+        if (_itemStack.Quantity == 0) ClearSlot();
+        else UpdateAllDisplay();
+
+        return result;
+    }
+
+    /// <summary>
+    /// <para>Remove the specified number of items and return them as a new item stack</para>
+    /// <para>取出当前物品槽中指定数量的物品，并作为新的物品堆返回</para>
+    /// </summary>
+    /// <param name="value">
+    /// <para>Quantity to be taken out, inputs below zero represent all items</para>
+    /// <para>要取出的数量，小于0的输入代表全部物品</para>
+    /// </param>
+    /// <seealso cref="PickItem"/>
+    public IItemStack? PickItems(int value)
+    {
+        if (_itemStack is null) return null;
+
+        var result = _itemStack.PickItems(value);
+        if (_itemStack.Quantity == 0) ClearSlot();
+        else UpdateAllDisplay();
+
+        return result;
+    }
 
     /// <summary>
     /// <para>Removes the specified number of items from the item slot</para>
@@ -53,6 +95,9 @@ public partial class ItemSlotNode : MarginContainer
     /// <para>The remaining number, if the number of items in the current item stack is less than the specified number. Otherwise,0</para>
     /// <para>若物品槽内物品少于指定的数量，返回相差的数量。否则返回0</para>
     /// </returns>
+    /// <remarks>
+    /// <para>会将移除的物品从游戏中删除，如果目的并非如此，请考虑使用</para>
+    /// </remarks>
     public int RemoveItem(int number)
     {
         if (_itemStack == null)
@@ -64,133 +109,139 @@ public partial class ItemSlotNode : MarginContainer
         //If the specified number of items is removed, the number of items is less than or equal to 0. Then we empty the inventory.
         //如果移除指定数量的物品后，物品数量小于或等于0。那么我们清空物品栏。
         if (_itemStack.Quantity == 0) ClearSlot();
-        else
-        {
-            UpdateTooltipText(_itemStack);
-            UpdateQuantityLabel(_itemStack.Quantity);
-        }
+        else UpdateAllDisplay();
 
         return result;
-
-        // var newNumber = _item.Quantity - number;
-        // if (newNumber <= 0)
-        // {
-        //     //If the specified number of items is removed, the number of items is less than or equal to 0. Then we return the removal successful and empty the inventory.
-        //     //如果移除指定数量的物品后，物品数量小于或等于0。那么我们返回移除成功，并清空物品栏。
-        //     ClearItem();
-        //     return true;
-        // }
-        // else
-        // {
-        //     _item.Quantity = newNumber;
-        //     UpdateTooltipText(_item);
-        //     UpdateQuantityLabel(_item.Quantity);
-        //     return true;
-        // }
     }
 
+    /// <summary>
+    /// <para>Remove item stack from slot and return it, equivalent to ReplaceItemStack(null)</para>
+    /// <para>从当前槽位中移出并返回物品堆，等价于ReplaceItemStack(null)</para>
+    /// <seealso cref="ReplaceItemStack"/>
+    /// </summary>
+    public IItemStack? RemoveItemStack() => ReplaceItemStack(null);
+
     /// <summary>
     /// <para>Empty the item slot</para>
-    /// <para>清空物品槽</para>
+    /// <para>清空当前物品槽</para>
     /// </summary>
     /// <remarks>
-    ///<para>This method does not calculate how many items should be left. If you want to remove a specified number of items, call the <see cref="RemoveItem"/> method.</para>
-    ///<para>此方法不会计算物品应该剩余多少个。若您希望移除指定数量的物品，请调用<see cref="RemoveItem"/>方法。</para>
+    ///<para>This method will remove all items stored in the item slots from the game, if this is not what you want to do, consider using the <see cref="RemoveItemStack"/> method.</para>
+    ///<para>此方法会从游戏中移除储存于物品槽中的所有物品，若这不是您希望的操作，请考虑使用<see cref="RemoveItemStack"/>方法。</para>
     /// </remarks>
     public void ClearSlot()
     {
+        _itemStack?.ClearStack();
         _itemStack = null;
-        
-        if (_iconTextureRect != null)
-        {
-            _iconTextureRect.Texture = null;
-        }
 
-        if (_control != null)
-        {
-            _control.TooltipText = null;
-        }
-
-        _quantityLabel?.Hide();
+        UpdateAllDisplay();
     }
 
-    //Todo: I searched until here.
-
     /// <summary>
     /// <para>Can the specified item be placed in the item slot?</para>
     /// <para>指定的物品是否可设置在物品槽内？</para>
     /// </summary>
     /// <param name="item"></param>
     /// <returns></returns>
-    public bool CanSetItem(IItem item)
+    public bool CanAddItem(IItem_New item)
     {
-        if (_item == null)
-        {
-            return true;
-        }
-
-        //This inventory already has items, but the items in this inventory are not the same as the incoming items
-        //这个物品栏已经有物品了，但是这个物品栏的物品和传入的物品不一样
-        if (_item.Id != item.Id)
-        {
-            return false;
-        }
-
-        var newQuantity = _item.Quantity + item.Quantity;
-        if (newQuantity > item.MaxStackQuantity)
-        {
-            //If the amount of the current item exceeds the maximum stack amount after placing it in this inventory
-            //如果将当前物品放置到这个物品栏后，数量超过了最大叠加数量
-            return false;
-        }
-
-        return true;
+        if (_itemStack == null) return true;
+        return _itemStack.CanAddItem(item);
     }
 
     /// <summary>
-    /// <para>Sets items for the item slot</para>
-    /// <para>为物品槽设置物品</para>
+    /// <para>
+    /// Set item stack for this slot, this will completely replace current item stack.
+    /// If you want the item stack to be added to current stack, use the <see cref="AddItemStack"/>.
+    /// </para>
+    /// <para>为物品槽设置物品堆，将完全替换掉当前物品堆。如果想要物品堆叠加至该物品堆，请使用<see cref="AddItemStack"/></para>
     /// </summary>
-    /// <param name="item"></param>
-    /// <returns></returns>
-    public bool SetItem(IItem item)
+    /// <returns>
+    /// <para>The item stack that was previously in this slot</para>
+    /// <para>该槽位中原本的物品堆</para>
+    /// </returns>
+    public IItemStack? ReplaceItemStack(IItemStack? newItemStack)
     {
-        if (!CanSetItem(item))
-        {
-            return false;
-        }
+        var result = _itemStack;
+        _itemStack = newItemStack;
 
-        if (_item == null)
-        {
-            if (item.Icon != null && _iconTextureRect != null)
-            {
-                _iconTextureRect.Texture = item.Icon;
-            }
+        UpdateAllDisplay();
 
-            _item = item;
-            UpdateTooltipText(item);
-            UpdateQuantityLabel(item.Quantity);
-            return true;
+        return result;
+    }
+
+    /// <summary>
+    /// <para>Try to add an item to this slot, if it can't be added to this slot, return false</para>
+    /// <para>尝试向当前槽位中加入物品，如果该物品不能被放入该槽位，返回false</para>
+    /// </summary>
+    public bool AddItem(IItem_New item)
+    {
+        bool result;
+        if (_itemStack is null)
+        {
+            _itemStack = IItemStack.FromItem(item);
+            result = true;
         }
         else
         {
-            var newQuantity = _item.Quantity + item.Quantity;
-            _item.Quantity = newQuantity;
-            UpdateTooltipText(item);
-            UpdateQuantityLabel(newQuantity);
-            return true;
+            result = _itemStack.AddItem(item);
         }
+
+        if (result)
+        {
+            UpdateAllDisplay();
+        }
+
+        return result;
+    }
+
+    /// <summary>
+    /// <para>Try to combine an item stack into this slot</para>
+    /// <para>尝试将一个物品堆合并至该槽位中</para>
+    /// </summary>
+    /// <returns>
+    /// <para>Number of items remaining in the source item pile after the operation is completed</para>
+    /// <para>操作完成后，源物品堆中剩余的物品数</para>
+    /// </returns>
+    public int AddItemStack(IItemStack itemStack)
+    {
+        int result;
+        if (_itemStack is null)
+        {
+            _itemStack = itemStack;
+            result = 0;
+        }
+        else
+        {
+            result = _itemStack.TakeFrom(itemStack);
+        }
+
+        UpdateAllDisplay();
+        return result;
+    }
+
+
+    /// <summary>
+    /// <para>Update all displays of this slot</para>
+    /// <para>更新该槽位的一切显示信息</para>
+    /// </summary>
+    private void UpdateAllDisplay()
+    {
+        UpdateIconTexture();
+        UpdateQuantityLabel();
+        UpdateTooltipText();
     }
 
     /// <summary>
     /// <para>Update item tips</para>
     /// <para>更新物品的提示内容</para>
     /// </summary>
-    /// <param name="item"></param>
-    private void UpdateTooltipText(IItem item)
+    private void UpdateTooltipText()
     {
-        if (_control == null)
+        if (_control == null) return;
+        if (_itemStack == null)
         {
+            _control.TooltipText = null;
             return;
         }
 
@@ -199,16 +250,16 @@ public partial class ItemSlotNode : MarginContainer
             var debugText = TranslationServerUtils.Translate("item_prompt_debug");
             if (debugText != null)
             {
-                _control.TooltipText = string.Format(debugText, item.Id,
-                                                     TranslationServerUtils.Translate(item.Name),
-                                                     item.Quantity, item.MaxStackQuantity, item.GetType().Name,
-                                                     TranslationServerUtils.Translate(item.Description));
+                _control.TooltipText = string.Format(debugText, _itemStack.Id,
+                                                     TranslationServerUtils.Translate(_itemStack.Name),
+                                                     _itemStack.Quantity, _itemStack.MaxQuantity, _itemStack.GetType().Name,
+                                                     TranslationServerUtils.Translate(_itemStack.Description));
             }
         }
         else
         {
-            _control.TooltipText = TranslationServerUtils.Translate(item.Name) + "\n" +
-                                   TranslationServerUtils.Translate(item.Description);
+            _control.TooltipText = TranslationServerUtils.Translate(_itemStack.Name) + "\n" +
+                                   TranslationServerUtils.Translate(_itemStack.Description);
         }
     }
 
@@ -216,28 +267,36 @@ public partial class ItemSlotNode : MarginContainer
     /// <para>Update quantity label</para>
     /// <para>更新数量标签</para>
     /// </summary>
-    /// <param name="quantity"></param>
-    private void UpdateQuantityLabel(int? quantity)
+    private void UpdateQuantityLabel()
     {
         if (_quantityLabel == null)
         {
             return;
         }
 
-        switch (quantity)
+        switch (_itemStack?.Quantity)
         {
-            case null:
+            case null or 1:
                 _quantityLabel.Hide();
                 return;
-            case > 1:
-                //When the quantity is greater than 1, we display the quantity.
-                //当数量大于1时，我们显示数量
-                _quantityLabel.Text = quantity.ToString();
+            default:
+                //When the quantity is not null or 1, we display the quantity.
+                //当数量不为null或1时，我们显示数量
+                _quantityLabel.Text = _itemStack?.Quantity.ToString();
                 _quantityLabel.Show();
                 break;
-            default:
-                _quantityLabel.Hide();
-                break;
+        }
+    }
+
+    /// <summary>
+    /// <para>Update texture of the icon rect</para>
+    /// <para>更新显示的物品图标</para>
+    /// </summary>
+    private void UpdateIconTexture()
+    {
+        if (_iconTextureRect != null)
+        {
+            _iconTextureRect.Texture = _itemStack?.Icon;
         }
     }
 
diff --git a/scripts/item/IItemStack.cs b/scripts/item/IItemStack.cs
index 1ff6bd9..1ebfba7 100644
--- a/scripts/item/IItemStack.cs
+++ b/scripts/item/IItemStack.cs
@@ -4,6 +4,9 @@ using Godot;
 
 namespace ColdMint.scripts.item;
 
+/// <summary>
+/// <para>Item stack in an inventory slot</para>
+/// </summary>
 public interface IItemStack
 {
     /// <summary>
@@ -36,10 +39,81 @@ public interface IItemStack
     /// </summary>
     string? Description { get; }
 
+    /// <summary>
+    /// <para>Determine whether a specified item can be accommodated</para>
+    /// <para>判断能否容纳指定物品</para>
+    /// </summary>
+    /// <returns></returns>
+    public bool CanAddItem(IItem_New item);
 
     /// <summary>
-    /// <para>Removes the specified number of items from current item stack</para>
-    /// <para>在当前物品堆移除指定数量的物品</para>
+    /// <para>Hold a given item</para>
+    /// </summary>
+    /// <param name="item">Item to hold by current stack</param>
+    /// <returns>Whether successful</returns>
+    public bool AddItem(IItem_New item);
+
+    /// <summary>
+    /// <para>判断能从指定物品堆中接收的物品数量</para>
+    /// </summary>
+    /// <param name="itemStack">
+    /// <para>向该物品堆中放入物品的物品堆</para>
+    /// <para>Item stack to add to the current stack</para>
+    /// </param>
+    /// <returns></returns>
+    public int CanTakeFrom(IItemStack itemStack);
+
+    /// <summary>
+    /// <para>将指定物品堆中尽可能多的物品移动至当前物品堆中，被移入当前堆的物品应从原物品堆中移除。</para>
+    /// </summary>
+    /// <param name="itemStack">
+    /// <para>被移入当前堆的物品堆</para>
+    /// </param>
+    /// <returns>
+    /// <para>操作结束后原物品堆中剩余的物品数</para>
+    /// </returns>
+    public int TakeFrom(IItemStack itemStack);
+
+    /// <summary>
+    /// <para>Get item instance at the top of current stack without removing it from stack</para>
+    /// <para>获取当前物品堆顶部的物品实例而不取出该物品</para>
+    /// <seealso cref="PickItem"/>
+    /// </summary>
+    /// <returns></returns>
+    public IItem_New? GetItem();
+
+    /// <summary>
+    /// <para>Pop the item instance at the top of current item stack and return it</para>
+    /// <para>取出当前物品堆顶部的物品实例并返回该物品</para>
+    /// <seealso cref="GetItem"/><seealso cref="PickItems"/>
+    /// </summary>
+    /// <returns></returns>
+    public IItem_New? PickItem();
+
+    /// <summary>
+    /// <para>Remove the specified number of items and return them as a new item stack</para>
+    /// <para>取出当前堆中指定数量的物品，并作为新的物品堆返回</para>
+    /// <seealso cref="PickItem"/>
+    /// </summary>
+    /// <param name="value">
+    /// <para>Quantity to be taken out, inputs below zero represent all items</para>
+    /// <para>要取出的数量，小于0的输入代表全部物品</para>
+    /// </param>
+    /// <returns>
+    /// <para>The item stack that is taken out, can be null if out nothing, should not be the current item stack itself</para>
+    /// <para>取出的物品堆，没有取出物品时可为null，不应是当前物品堆自身</para>
+    /// </returns>
+    public IItemStack? PickItems(int value);
+
+    /// <summary>
+    /// <para>
+    /// Removes the specified number of items from current item stack,removed items should be removed from the game<br/>
+    /// If you don't want remove them from game, consider <see cref="PickItem"/> and <see cref="PickItems"/>
+    /// </para>
+    /// <para>
+    /// 在当前物品堆移除指定数量的物品，被移除的物品应当从游戏中移除。<br/>
+    /// 如果您不想将它们从游戏中移除，请考虑： <see cref="PickItem"/>、<see cref="PickItems"/>
+    /// </para>
     /// </summary>
     /// <param name="number"></param>
     /// <returns>
@@ -48,6 +122,11 @@ public interface IItemStack
     /// </returns>
     public int RemoveItem(int number);
 
+    /// <summary>
+    /// <para>Clear current stack, which means should dispose all items inside current stack here</para>
+    /// </summary>
+    public void ClearStack();
+
     /// <summary>
     /// Create a new ItemStack with the given item as the first item
     /// </summary>
diff --git a/scripts/item/IItem_New.cs b/scripts/item/IItem_New.cs
index d98e25d..a046842 100644
--- a/scripts/item/IItem_New.cs
+++ b/scripts/item/IItem_New.cs
@@ -28,4 +28,9 @@ public interface IItem_New
     /// <param name="owner">Owner of current item, if any</param>
     /// <param name="targetGlobalPosition">Target position, such as the position of the cursor when used by the player</param>
     void Use(Node2D? owner, Vector2 targetGlobalPosition);
+
+    /// <summary>
+    /// <para>Execute when current item be removed from game.</para>
+    /// </summary>
+    void Destroy();
 }
\ No newline at end of file
diff --git a/scripts/item/SingleItemStack.cs b/scripts/item/SingleItemStack.cs
index b853990..d7c3415 100644
--- a/scripts/item/SingleItemStack.cs
+++ b/scripts/item/SingleItemStack.cs
@@ -1,21 +1,41 @@
-using ColdMint.scripts.inventory;
+using System;
+
+using ColdMint.scripts.inventory;
 
 using Godot;
 
 namespace ColdMint.scripts.item;
 
 /// <summary>
-/// <para>Item stack in inventory</para>
+/// <para>Item stack of single item</para>
 /// </summary>
 //maybe we'd move this into inventory namespace
-public readonly struct SingleItemStack(IItem_New item) : IItemStack
+public struct SingleItemStack(IItem_New item) : IItemStack
 {
     public IItem_New Item { get; init; } = item;
 
     public string Id => Item.Id;
     public int MaxQuantity => 1;
-    public int Quantity => 1;
+    public int Quantity { get; set; } = 1;
     public Texture2D Icon => Item.Icon;
     public string Name => Item.Name;
     public string? Description => Item.Description;
+
+    public bool CanAddItem(IItem_New item) => false;
+
+    public bool AddItem(IItem_New item) => false;
+
+    public int CanTakeFrom(IItemStack itemStack) => 0;
+
+    public int TakeFrom(IItemStack itemStack) => 0;
+
+    public int RemoveItem(int number)
+    {
+        
+    }
+
+    public void ClearStack()
+    {
+        throw new System.NotImplementedException();
+    }
 }
\ No newline at end of file