diff --git a/prefab/common/ThrowNode.tscn b/prefab/common/ThrowNode.tscn
deleted file mode 100644
index a35c9a7..0000000
--- a/prefab/common/ThrowNode.tscn
+++ /dev/null
@@ -1,12 +0,0 @@
-[gd_scene load_steps=3 format=2]
-
-[ext_resource path="res://icon.png" type="Texture" id=1]
-[ext_resource path="res://src/weapon/ThrowNode.cs" type="Script" id=2]
-
-[node name="ThrowNode" type="Node2D"]
-position = Vector2( 140, 141 )
-script = ExtResource( 2 )
-
-[node name="Icon" type="Sprite" parent="."]
-scale = Vector2( 0.3, 0.3 )
-texture = ExtResource( 1 )
diff --git a/prefab/shell/ShellCase.tscn b/prefab/shell/ShellCase.tscn
new file mode 100644
index 0000000..8741487
--- /dev/null
+++ b/prefab/shell/ShellCase.tscn
@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://resource/sprite/shell/shellCase.png" type="Texture" id=1]
+
+[node name="ShellCase" type="Sprite"]
+texture = ExtResource( 1 )
diff --git a/prefab/weapon/Gun.tscn b/prefab/weapon/Gun.tscn
index 3bbecf2..eec577f 100644
--- a/prefab/weapon/Gun.tscn
+++ b/prefab/weapon/Gun.tscn
@@ -1,8 +1,9 @@
-[gd_scene load_steps=5 format=2]
+[gd_scene load_steps=6 format=2]
 
 [ext_resource path="res://src/weapon/gun/OrdinaryGun.cs" type="Script" id=1]
 [ext_resource path="res://prefab/weapon/bullet/OrdinaryBullets.tscn" type="PackedScene" id=2]
 [ext_resource path="res://resource/sprite/gun/gun1.png" type="Texture" id=3]
+[ext_resource path="res://prefab/shell/ShellCase.tscn" type="PackedScene" id=4]
 
 [sub_resource type="RectangleShape2D" id=1]
 extents = Vector2( 9.5, 3.5 )
@@ -11,6 +12,7 @@
 z_index = 5
 script = ExtResource( 1 )
 bulletPacked = ExtResource( 2 )
+shell = ExtResource( 4 )
 
 [node name="GunSprite" type="Sprite" parent="."]
 position = Vector2( 4, -3 )
diff --git a/resource/sprite/shell/shellCase.aseprite b/resource/sprite/shell/shellCase.aseprite
new file mode 100644
index 0000000..b24b3c9
--- /dev/null
+++ b/resource/sprite/shell/shellCase.aseprite
Binary files differ
diff --git a/resource/sprite/shell/shellCase.png b/resource/sprite/shell/shellCase.png
new file mode 100644
index 0000000..390aef4
--- /dev/null
+++ b/resource/sprite/shell/shellCase.png
Binary files differ
diff --git a/resource/sprite/shell/shellCase.png.import b/resource/sprite/shell/shellCase.png.import
new file mode 100644
index 0000000..b4b5232
--- /dev/null
+++ b/resource/sprite/shell/shellCase.png.import
@@ -0,0 +1,35 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/shellCase.png-4975fbe4d212e558e86355116ac96ab2.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://resource/sprite/shell/shellCase.png"
+dest_files=[ "res://.import/shellCase.png-4975fbe4d212e558e86355116ac96ab2.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=false
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+process/normal_map_invert_y=false
+stream=false
+size_limit=0
+detect_3d=false
+svg/scale=1.0
diff --git a/scene/Room.tscn b/scene/Room.tscn
index 5900efa..7223c4d 100644
--- a/scene/Room.tscn
+++ b/scene/Room.tscn
@@ -1,16 +1,14 @@
-[gd_scene load_steps=6 format=2]
+[gd_scene load_steps=5 format=2]
 
 [ext_resource path="res://prefab/role/Player.tscn" type="PackedScene" id=1]
 [ext_resource path="res://resource/map/dungeon_test.tmx" type="PackedScene" id=2]
 [ext_resource path="res://src/room/RoomManager.cs" type="Script" id=3]
 [ext_resource path="res://prefab/ui/Cursor.tscn" type="PackedScene" id=4]
-[ext_resource path="res://prefab/common/ThrowNode.tscn" type="PackedScene" id=5]
 
 [node name="Room" type="Node2D"]
 script = ExtResource( 3 )
 MouseCursor = ExtResource( 4 )
 UIPath = NodePath("")
-ThrowNode = ExtResource( 5 )
 
 [node name="MapRoot" type="Node2D" parent="."]
 
@@ -23,8 +21,10 @@
 smoothing_enabled = true
 smoothing_speed = 8.0
 
-[node name="Player" parent="." instance=ExtResource( 1 )]
+[node name="YSort" type="YSort" parent="."]
+
+[node name="Player" parent="YSort" instance=ExtResource( 1 )]
 position = Vector2( 196, 128 )
 
-[node name="RemoteTransform2D" type="RemoteTransform2D" parent="Player"]
-remote_path = NodePath("../../Camera2D")
+[node name="RemoteTransform2D" type="RemoteTransform2D" parent="YSort/Player"]
+remote_path = NodePath("../../../Camera2D")
diff --git a/src/GameConfig.cs b/src/GameConfig.cs
index f1fa592..3b94e9d 100644
--- a/src/GameConfig.cs
+++ b/src/GameConfig.cs
@@ -2,7 +2,11 @@
 public static class GameConfig
 {
     /// <summary>
-    /// 
+    /// 散射计算的默认距离
     /// </summary>
     public static readonly float ScatteringDistance = 300;
+    /// <summary>
+    /// 重力加速度
+    /// </summary>
+    public static readonly float G = 200f;
 }
\ No newline at end of file
diff --git a/src/common/CommonNodeManager.cs b/src/common/CommonNodeManager.cs
index 6d0f516..83c1c90 100644
--- a/src/common/CommonNodeManager.cs
+++ b/src/common/CommonNodeManager.cs
@@ -2,10 +2,5 @@
 
 public static class CommonNodeManager
 {
-    public const string ThrowNodeResPath = "";
 
-    public static ThrowNode CreateThrowNode(Vector2 start, Vector2 target, float startHeight, float targetHeight, float moveSpeed, float rotationSpeed)
-    {
-        return null;
-    }
 }
\ No newline at end of file
diff --git a/src/manager/GameManager.cs b/src/manager/GameManager.cs
index 24462e8..29d3962 100644
--- a/src/manager/GameManager.cs
+++ b/src/manager/GameManager.cs
@@ -5,5 +5,9 @@
 /// </summary>
 public class GameManager : Node2D
 {
-    
+    public static GameManager Instance { get; private set; }
+    public GameManager()
+    {
+        GameManager.Instance = this;
+    }
 }
\ No newline at end of file
diff --git a/src/room/RoomManager.cs b/src/room/RoomManager.cs
index 4896dad..f27f508 100644
--- a/src/room/RoomManager.cs
+++ b/src/room/RoomManager.cs
@@ -12,12 +12,11 @@
 
     [Export] public NodePath UIPath;
 
-    [Export] public PackedScene ThrowNode;
-
     public static RoomManager Current { get; private set; }
 
     public CanvasLayer UI;
     public Cursor Cursor { get; private set; }
+    public YSort ItemRoot { get; private set; }
 
     public override void _EnterTree()
     {
@@ -27,10 +26,13 @@
         Cursor = MouseCursor.Instance<Cursor>();
         AddChild(Cursor);
 
+        ItemRoot = GetNode<YSort>("YSort");
+
         //初始化地图
         var node = GetNode("MapRoot").GetChild(0).GetNode("Config");
         Color color = (Color) node.GetMeta("ClearColor");
         VisualServer.SetDefaultClearColor(color);
+
     }
 
     public override void _Draw()
diff --git a/src/weapon/ThrowNode.cs b/src/weapon/ThrowNode.cs
index 17a2e87..718f8ad 100644
--- a/src/weapon/ThrowNode.cs
+++ b/src/weapon/ThrowNode.cs
@@ -6,42 +6,44 @@
 /// </summary>
 public class ThrowNode : Node2D
 {
-    public float MaxHeight = 30;
-    public float TargetHeight = 0;
-    public float StartHeight = 0;
+    public bool IsOver { get; protected set; } = true;
 
-    public Vector2 StartPos;
-    public Vector2 TargetPos = new Vector2(120, 100);
-    public Vector2 RealPosition = Vector2.Zero;
+    private Vector2 StartPosition;
+    private float Direction;
+    private Vector2 Velocity;
+    private Node2D Mount;
 
-
-    public override void _Ready()
+    public void InitThrow(Vector2 start, float direction, Vector2 velocity, Node2D mount)
     {
-        StartPos = GlobalPosition;
-        RealPosition = StartPos;
+        IsOver = false;
+        GlobalPosition = StartPosition = start;
+        Direction = direction;
+        Velocity = velocity;
+
+        Mount = mount;
+        AddChild(mount);
+        mount.Position = Vector2.Zero;
+    }
+
+    protected virtual void OnOver()
+    {
+
     }
 
     public override void _Process(float delta)
     {
-        if (RealPosition.DistanceSquaredTo(TargetPos) > 1)
+        if (!IsOver)
         {
-            float v = (StartPos.DistanceTo(RealPosition)) / (StartPos.DistanceTo(TargetPos));
-            float progress = Mathf.Sin(v * Mathf.Pi);
+            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;
 
-            float y = 0;
-            if (v <= 0.5f)
+            if (Mount.Position.y >= 0)
             {
-                y = Mathf.Lerp(StartHeight, MaxHeight, progress);
+                Mount.Position = new Vector2(0, 0);
+                IsOver = true;
             }
-            else
-            {
-                y = Mathf.Lerp(TargetHeight, MaxHeight, progress);
-            }
-
-            RealPosition = RealPosition.MoveToward(TargetPos, 100 * delta);
-            GlobalPosition = RealPosition - new Vector2(0, y);
         }
-
     }
 
 }
\ No newline at end of file
diff --git a/src/weapon/gun/Gun.cs b/src/weapon/gun/Gun.cs
index a511109..74303f0 100644
--- a/src/weapon/gun/Gun.cs
+++ b/src/weapon/gun/Gun.cs
@@ -37,6 +37,12 @@
     /// 枪攻击的目标阵营
     /// </summary>
     public CampEnum TargetCamp { get; set; }
+
+    /// <summary>
+    /// 该武器的拥有者
+    /// </summary>
+    public Node2D Master { get; }
+
     /// <summary>
     /// 枪管的开火点
     /// </summary>
@@ -322,7 +328,7 @@
         bullet.GlobalRotation = globalRotation;
         if (parent == null)
         {
-            GetTree().CurrentScene.AddChild(bullet);
+            RoomManager.Current.ItemRoot.AddChild(bullet);
         }
         else
         {
diff --git a/src/weapon/gun/OrdinaryGun.cs b/src/weapon/gun/OrdinaryGun.cs
index 1bb47c5..352d95b 100644
--- a/src/weapon/gun/OrdinaryGun.cs
+++ b/src/weapon/gun/OrdinaryGun.cs
@@ -9,6 +9,8 @@
 
     [Export] public PackedScene bulletPacked;
 
+    [Export] public PackedScene shell;
+
     protected override void Init()
     {
 
@@ -16,7 +18,10 @@
 
     protected override void Fire()
     {
-        
+        //创建一个弹壳
+        var temp = new ThrowNode();
+        temp.InitThrow(GlobalPosition, 30, new Vector2(30, -100), shell.Instance<Node2D>());
+        RoomManager.Current.ItemRoot.AddChild(temp);
     }
 
     protected override void ShootBullet()