diff --git a/prefab/projectile/curseOfTheUndead.tscn b/prefab/projectile/curseOfTheUndead.tscn
index 8f16dfa..3aefe50 100644
--- a/prefab/projectile/curseOfTheUndead.tscn
+++ b/prefab/projectile/curseOfTheUndead.tscn
@@ -15,7 +15,6 @@ _maxDamage = 10
 _minDamage = 1
 _damageType = 2
 Speed = 500.0
-_enableTracking = true
 _targetDiesDestroyProjectile = true
 _repelStrength = 2.5
 
diff --git a/scripts/character/AiCharacter.cs b/scripts/character/AiCharacter.cs
index 32abb5c..41e910f 100644
--- a/scripts/character/AiCharacter.cs
+++ b/scripts/character/AiCharacter.cs
@@ -180,6 +180,7 @@ public sealed partial class AiCharacter : CharacterTemplate
         //You must create an item container for the character before you can pick up the item.
         //必须为角色创建物品容器后才能拾起物品。
         var universalItemContainer = new UniversalItemContainer(1);
+        universalItemContainer.AllowAddingItemByType(Config.ItemType.ProjectileWeapon);
         ProtectedItemContainer = universalItemContainer;
         //Add initial weapon
         //添加初始武器
diff --git a/scripts/character/CharacterTemplate.cs b/scripts/character/CharacterTemplate.cs
index b64987b..fab0371 100644
--- a/scripts/character/CharacterTemplate.cs
+++ b/scripts/character/CharacterTemplate.cs
@@ -481,10 +481,10 @@ public partial class CharacterTemplate : CharacterBody2D
 
         if (_currentItem is IItem item)
         {
-            item.Use(this, position);
+            return item.Use(this, position);
         }
 
-        return true;
+        return false;
     }
 
     public override void _Process(double delta)
diff --git a/scripts/inventory/IItem.cs b/scripts/inventory/IItem.cs
index 185c316..92e4745 100644
--- a/scripts/inventory/IItem.cs
+++ b/scripts/inventory/IItem.cs
@@ -126,7 +126,11 @@ public interface IItem
     /// </summary>
     /// <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);
+    /// <returns>
+    ///<para>Whether it was successfully executed</para>
+    ///<para>是否成功被执行了</para>
+    /// </returns>
+    bool Use(Node2D? owner, Vector2 targetGlobalPosition);
 
     /// <summary>
     /// <para>When the item is thrown</para>
diff --git a/scripts/inventory/Packsack.cs b/scripts/inventory/Packsack.cs
index 88e7a9c..906450c 100644
--- a/scripts/inventory/Packsack.cs
+++ b/scripts/inventory/Packsack.cs
@@ -18,9 +18,13 @@ public partial class Packsack : PickAbleTemplate
         get => Config.ItemType.Packsack;
     }
     [Export] public int NumberSlots { get; set; }
-    public override void Use(Node2D? owner, Vector2 targetGlobalPosition)
+    public override bool Use(Node2D? owner, Vector2 targetGlobalPosition)
     {
-        GameSceneDepend.DynamicUiGroup?.ShowControl(Path, control =>
+        if (GameSceneDepend.DynamicUiGroup == null)
+        {
+            return false;
+        }
+        return GameSceneDepend.DynamicUiGroup.ShowControl(Path, control =>
         {
             if (control is PacksackUi packsackUi)
             {
diff --git a/scripts/inventory/PlaceholderItem.cs b/scripts/inventory/PlaceholderItem.cs
index 419599c..e0d1ec7 100644
--- a/scripts/inventory/PlaceholderItem.cs
+++ b/scripts/inventory/PlaceholderItem.cs
@@ -50,8 +50,9 @@ public class PlaceholderItem : IItem
         return null;
     }
 
-    public void Use(Node2D? owner, Vector2 targetGlobalPosition)
+    public bool Use(Node2D? owner, Vector2 targetGlobalPosition)
     {
+        return false;
     }
 
     public void OnThrow(Vector2 velocity)
diff --git a/scripts/pickable/PickAbleTemplate.cs b/scripts/pickable/PickAbleTemplate.cs
index 906c079..93a1ac3 100644
--- a/scripts/pickable/PickAbleTemplate.cs
+++ b/scripts/pickable/PickAbleTemplate.cs
@@ -182,8 +182,9 @@ public partial class PickAbleTemplate : RigidBody2D, IItem
         return Math.Min(freeQuantity, unallocatedQuantity);
     }
 
-    public virtual void Use(Node2D? owner, Vector2 targetGlobalPosition)
+    public virtual bool Use(Node2D? owner, Vector2 targetGlobalPosition)
     {
+        return false;
     }
 
     public virtual void OnThrow(Vector2 velocity)
diff --git a/scripts/weapon/WeaponTemplate.cs b/scripts/weapon/WeaponTemplate.cs
index 43dd365..a45a591 100644
--- a/scripts/weapon/WeaponTemplate.cs
+++ b/scripts/weapon/WeaponTemplate.cs
@@ -25,9 +25,9 @@ public abstract partial class WeaponTemplate : PickAbleTemplate
         _audioStreamPlayer2D = GetNodeOrNull<AudioStreamPlayer2D>("Marker2D/AudioStreamPlayer2D");
     }
 
-    public override void Use(Node2D? owner, Vector2 targetGlobalPosition)
+    public override bool Use(Node2D? owner, Vector2 targetGlobalPosition)
     {
-        Fire(owner, targetGlobalPosition);
+        return Fire(owner, targetGlobalPosition);
     }
 
 
@@ -77,15 +77,16 @@ public abstract partial class WeaponTemplate : PickAbleTemplate
     ///<para>敌人所在位置</para>
     /// </param>
     /// </remarks>
-    public void Fire(Node2D? owner, Vector2 enemyGlobalPosition)
+    public bool Fire(Node2D? owner, Vector2 enemyGlobalPosition)
     {
         var nowTime = DateTime.Now;
         //If the present time minus the time of the last fire is less than the interval between fires, it means that the fire cannot be fired yet.
         //如果现在时间减去上次开火时间小于开火间隔，说明还不能开火。
         if (_lastFiringTime != null && nowTime - _lastFiringTime < _firingInterval)
         {
-            return;
+            return false;
         }
+        _lastFiringTime = nowTime;
         var result = DoFire(owner, enemyGlobalPosition);
         if (result)
         {
@@ -96,10 +97,9 @@ public abstract partial class WeaponTemplate : PickAbleTemplate
                     characterTemplate.AddForce(enemyGlobalPosition.DirectionTo(characterTemplate.GlobalPosition) * _recoilStrength * Config.CellSize);
                 }
             }
-
             _audioStreamPlayer2D?.Play();
         }
-        _lastFiringTime = nowTime;
+        return result;
     }
 
     /// <summary>