diff --git a/prefab/weapon/Gun.tscn b/prefab/weapon/Gun.tscn
index eec577f..35e9f95 100644
--- a/prefab/weapon/Gun.tscn
+++ b/prefab/weapon/Gun.tscn
@@ -21,11 +21,12 @@
 
 [node name="OriginPoint" type="Position2D" parent="."]
 position = Vector2( 0, -1.5 )
-scale = Vector2( 0.8, 0.8 )
+
+[node name="ShellPoint" type="Position2D" parent="."]
+position = Vector2( 1, -3 )
 
 [node name="FirePoint" type="Position2D" parent="."]
 position = Vector2( 11, -1.5 )
-scale = Vector2( 0.8, 0.8 )
 
 [node name="Area" type="Area2D" parent="."]
 collision_layer = 4
diff --git a/resource/sprite/shell/shellCase.png b/resource/sprite/shell/shellCase.png
index 390aef4..c6db56d 100644
--- a/resource/sprite/shell/shellCase.png
+++ b/resource/sprite/shell/shellCase.png
Binary files differ
diff --git a/src/GameConfig.cs b/src/GameConfig.cs
index 3b94e9d..91ebe06 100644
--- a/src/GameConfig.cs
+++ b/src/GameConfig.cs
@@ -8,5 +8,5 @@
     /// <summary>
     /// 重力加速度
     /// </summary>
-    public static readonly float G = 200f;
+    public static readonly float G = 250f;
 }
\ No newline at end of file
diff --git a/src/weapon/ThrowNode.cs b/src/weapon/ThrowNode.cs
index 718f8ad..bc69dc6 100644
--- a/src/weapon/ThrowNode.cs
+++ b/src/weapon/ThrowNode.cs
@@ -8,21 +8,25 @@
 {
     public bool IsOver { get; protected set; } = true;
 
-    private Vector2 StartPosition;
-    private float Direction;
-    private Vector2 Velocity;
-    private Node2D Mount;
+    public Vector2 StartPosition { get; protected set; }
+    public float Direction { get; protected set; }
+    public float XForce { get; protected set; }
+    public float YForce { get; protected set; }
+    public float RotateSpeed { get; protected set; }
+    public Node2D Mount { get; protected set; }
 
-    public void InitThrow(Vector2 start, float direction, Vector2 velocity, Node2D mount)
+    public void InitThrow(Vector2 start, float startHeight, float direction, float xForce, float yForce, float rotate, Node2D mount)
     {
         IsOver = false;
         GlobalPosition = StartPosition = start;
         Direction = direction;
-        Velocity = velocity;
+        XForce = xForce;
+        YForce = -yForce;
+        RotateSpeed = rotate;
 
         Mount = mount;
         AddChild(mount);
-        mount.Position = Vector2.Zero;
+        mount.Position = new Vector2(0, -startHeight);
     }
 
     protected virtual void OnOver()
@@ -34,9 +38,10 @@
     {
         if (!IsOver)
         {
-            Position += new Vector2(Velocity.x * delta, 0).Rotated(Direction * Mathf.Pi / 180);
-            Mount.Position = new Vector2(0, Mount.Position.y + Velocity.y * delta);
-            Velocity.y += GameConfig.G * delta;
+            Position += new Vector2(XForce * delta, 0).Rotated(Direction * Mathf.Pi / 180);
+            Mount.Position = new Vector2(0, Mount.Position.y + YForce * delta);
+            Mount.GlobalRotationDegrees += RotateSpeed * delta;
+            YForce += GameConfig.G * delta;
 
             if (Mount.Position.y >= 0)
             {
diff --git a/src/weapon/gun/Gun.cs b/src/weapon/gun/Gun.cs
index 74303f0..52fd2e7 100644
--- a/src/weapon/gun/Gun.cs
+++ b/src/weapon/gun/Gun.cs
@@ -52,6 +52,10 @@
     /// </summary>
     public Position2D OriginPoint { get; private set; }
     /// <summary>
+    /// 弹壳抛出的点
+    /// </summary>
+    public Position2D ShellPoint { get; private set; }
+    /// <summary>
     /// 枪的当前散射半径
     /// </summary>
     public float CurrScatteringRange { get; private set; } = 0;
@@ -83,6 +87,7 @@
         GunSprite = GetNode<Sprite>("GunSprite");
         FirePoint = GetNode<Position2D>("FirePoint");
         OriginPoint = GetNode<Position2D>("OriginPoint");
+        ShellPoint = GetNode<Position2D>("ShellPoint");
     }
 
     public override void _Process(float delta)
diff --git a/src/weapon/gun/OrdinaryGun.cs b/src/weapon/gun/OrdinaryGun.cs
index 352d95b..0aa25c9 100644
--- a/src/weapon/gun/OrdinaryGun.cs
+++ b/src/weapon/gun/OrdinaryGun.cs
@@ -20,7 +20,13 @@
     {
         //创建一个弹壳
         var temp = new ThrowNode();
-        temp.InitThrow(GlobalPosition, 30, new Vector2(30, -100), shell.Instance<Node2D>());
+        var startPos = GlobalPosition + new Vector2(0, 5);
+        var startHeight = 16;
+        var direction = GlobalRotationDegrees + MathUtils.RandRangeInt(-30, 30) + 180;
+        var xf = MathUtils.RandRangeInt(20, 60);
+        var yf = MathUtils.RandRangeInt(60, 120);
+        var rotate = MathUtils.RandRangeInt(-720, 720);
+        temp.InitThrow(startPos, startHeight, direction, xf, yf, rotate, shell.Instance<Node2D>());
         RoomManager.Current.ItemRoot.AddChild(temp);
     }