diff --git a/src/main/java/com/example/tankbattle/Bullet.java b/src/main/java/com/example/tankbattle/Bullet.java
index 5183ef9..e7a4f65 100644
--- a/src/main/java/com/example/tankbattle/Bullet.java
+++ b/src/main/java/com/example/tankbattle/Bullet.java
@@ -3,14 +3,13 @@ package com.example.tankbattle;
 import java.awt.Graphics;
 import java.awt.Rectangle;
 
-public class Bullet {
+public class Bullet extends GameObject{
     private static final int SPEED = 6;
     public static int WIDTH = ResourceMgr.bulletD.getWidth();
     public static int HEIGHT = ResourceMgr.bulletD.getHeight();
 
     Rectangle rect = new Rectangle();
 
-    private int x, y;
     private Dir dir;
 
     private boolean living = true;
@@ -29,7 +28,7 @@ public class Bullet {
         rect.width = WIDTH;
         rect.height = HEIGHT;
 
-        gm.bullets.add(this);
+        gm.add(this);
     }
 
     public Group getGroup() {
@@ -40,9 +39,10 @@ public class Bullet {
         this.group = group;
     }
 
+    @Override
     public void paint(Graphics g) {
         if (!living) {
-            gm.bullets.remove(this);
+            gm.remove(this);
         }
         switch (dir) {
             case LEFT:
@@ -89,15 +89,17 @@ public class Bullet {
         if (x < 0 || y < 0 || x > TankFrame.GAME_WIDTH || y > TankFrame.GAME_HEIGHT) living = false;
     }
 
-    public void collideWith(Tank tank){
-        if (this.group == tank.getGroup()) return;
+    public boolean collideWith(Tank tank){
+        if (this.group == tank.getGroup()) return false;
         if (rect.intersects(tank.rect)) {
             tank.die();
             this.die();
             int eX = tank.getX() + Tank.WIDTH / 2 - Explode.WIDTH / 2;
             int eY = tank.getY() + Tank.HEIGHT / 2 - Explode.HEIGHT / 2;
-            gm.explodes.add(new Explode(eX, eY, gm));
+            gm.add(new Explode(eX, eY, gm));
+            return true;
         }
+        return false;
     }
 
     private void die() {
diff --git a/src/main/java/com/example/tankbattle/Explode.java b/src/main/java/com/example/tankbattle/Explode.java
index 6f54ef8..096d5ca 100644
--- a/src/main/java/com/example/tankbattle/Explode.java
+++ b/src/main/java/com/example/tankbattle/Explode.java
@@ -2,12 +2,10 @@ package com.example.tankbattle;
 
 import java.awt.Graphics;
 
-public class Explode {
+public class Explode extends GameObject {
     public static int WIDTH = ResourceMgr.explodes[0].getWidth();
     public static int HEIGHT = ResourceMgr.explodes[0].getHeight();
 
-    private int x, y;
-
     GameModel gm = null;
 
     private int step = 0;
@@ -20,12 +18,13 @@ public class Explode {
         new Thread(() -> new Audio("audio/explode.wav").play()).start();
     }
 
+    @Override
     public void paint(Graphics g) {
 
         g.drawImage(ResourceMgr.explodes[step++], x, y, null);
 
         if (step >= ResourceMgr.explodes.length)
-            gm.explodes.remove(this);
+            gm.remove(this);
 
     }
 }
diff --git a/src/main/java/com/example/tankbattle/GameModel.java b/src/main/java/com/example/tankbattle/GameModel.java
index 201e2f1..7c7696f 100644
--- a/src/main/java/com/example/tankbattle/GameModel.java
+++ b/src/main/java/com/example/tankbattle/GameModel.java
@@ -1,5 +1,10 @@
 package com.example.tankbattle;
 
+import com.example.tankbattle.cor.BulletTankCollider;
+import com.example.tankbattle.cor.Collider;
+import com.example.tankbattle.cor.ColliderChain;
+import com.example.tankbattle.cor.TankTankCollider;
+
 import java.awt.Color;
 import java.awt.Graphics;
 import java.util.ArrayList;
@@ -11,16 +16,27 @@ public class GameModel {
     List<Bullet> bullets = new ArrayList<>();
     List<Tank> tanks = new ArrayList<>();
     List<Explode> explodes = new ArrayList<>();
+    ColliderChain chain = new ColliderChain();
+
+    List<GameObject> objects = new ArrayList<>();
 
     public GameModel() {
         int initTankCount = Integer.valueOf(PropertyMgr.get("initTankCount"));
 
         // 初始化敌方坦克
         for (int i = 0; i < initTankCount; i++) {
-            tanks.add(new Tank(50 + i * 80, 200, Dir.DOWN, Group.BAD, this));
+            add(new Tank(50 + i * 80, 200, Dir.DOWN, Group.BAD, this));
         }
     }
 
+    public void add(GameObject go) {
+        this.objects.add(go);
+    }
+
+    public void remove(GameObject go) {
+        this.objects.remove(go);
+    }
+
     public void paint(Graphics g) {
         Color c = g.getColor();
         g.setColor(Color.WHITE);
@@ -30,22 +46,25 @@ public class GameModel {
         g.setColor(c);
 
         myTank.paint(g);
-        for (int i = 0; i < bullets.size(); i++) {
-            bullets.get(i).paint(g);
-        }
-
-        for (int i = 0; i < tanks.size(); i++) {
-            tanks.get(i).paint(g);
+        for (int i = 0; i < objects.size(); i++) {
+            objects.get(i).paint(g);
         }
 
-        for (int i = 0; i < explodes.size(); i++) {
-            explodes.get(i).paint(g);
+        // 互相碰撞逻辑
+        for (int i = 0; i < objects.size(); i++) {
+            for (int j = i + 1; j < objects.size(); j++) {
+                GameObject o1 = objects.get(i);
+                GameObject o2 = objects.get(j);
+//                collider.collide(o1, o2);
+//                collider2.collide(o1, o2);
+                chain.collide(o1, o2);
+            }
         }
 
-        for (int i = 0; i < bullets.size(); i++) {
-            for (int j = 0; j < tanks.size(); j++)
-                bullets.get(i).collideWith(tanks.get(j));
-        }
+//        for (int i = 0; i < bullets.size(); i++) {
+//            for (int j = 0; j < tanks.size(); j++)
+//                bullets.get(i).collideWith(tanks.get(j));
+//        }
 
 //        for (Iterator<Bullet> it = bullets.iterator(); it.hasNext()) {
 //            Bullet b = it.next();
diff --git a/src/main/java/com/example/tankbattle/GameObject.java b/src/main/java/com/example/tankbattle/GameObject.java
new file mode 100644
index 0000000..10d51b5
--- /dev/null
+++ b/src/main/java/com/example/tankbattle/GameObject.java
@@ -0,0 +1,10 @@
+package com.example.tankbattle;
+
+import java.awt.Graphics;
+
+public abstract class GameObject {
+    public int x;
+    public int y;
+
+    public abstract void paint(Graphics g);
+}
diff --git a/src/main/java/com/example/tankbattle/Tank.java b/src/main/java/com/example/tankbattle/Tank.java
index f513842..480c148 100644
--- a/src/main/java/com/example/tankbattle/Tank.java
+++ b/src/main/java/com/example/tankbattle/Tank.java
@@ -1,9 +1,12 @@
 package com.example.tankbattle;
 
+import com.example.tankbattle.strategy.DefaultFireStrategy;
+import com.example.tankbattle.strategy.FireStrategy;
+
 import java.awt.*;
 import java.util.Random;
 
-public class Tank {
+public class Tank extends GameObject{
     private static final int SPEED = 2;
 
     public static int WIDTH = ResourceMgr.goodTankU.getWidth();
@@ -13,18 +16,16 @@ public class Tank {
 
     private Random random = new Random();
 
-    int x,y;
-
-    Dir dir = Dir.DOWN;
+    public Dir dir = Dir.DOWN;
 
     private boolean moving = true;
 
     private boolean living = true;
 
-    Group group = Group.BAD;
+    public Group group = Group.BAD;
 
     FireStrategy fs;
-    GameModel gm;
+    public GameModel gm;
 
     public Tank(int x, int y, Dir dir, Group group, GameModel gm) {
         super();
@@ -53,6 +54,10 @@ public class Tank {
         }
     }
 
+    public Rectangle getRect() {
+        return rect;
+    }
+
     public void fire(){
         fs.fire(this);
     }
@@ -123,8 +128,10 @@ public class Tank {
         this.dir = Dir.values()[random.nextInt(4)];
     }
 
+
+    @Override
     public void paint(Graphics g) {
-        if (!living) gm.tanks.remove(this);
+        if (!living) gm.remove(this);
         switch (dir) {
             case LEFT:
                 g.drawImage(this.group == Group.GOOD ? ResourceMgr.goodTankL : ResourceMgr.badTankL, x, y, null);
@@ -163,4 +170,9 @@ public class Tank {
     public void die() {
         this.living = false;
     }
+
+    public void stop() {
+        this.moving = false;
+    }
+
 }
diff --git a/src/main/java/com/example/tankbattle/cor/BulletTankCollider.java b/src/main/java/com/example/tankbattle/cor/BulletTankCollider.java
new file mode 100644
index 0000000..7cf008e
--- /dev/null
+++ b/src/main/java/com/example/tankbattle/cor/BulletTankCollider.java
@@ -0,0 +1,26 @@
+package com.example.tankbattle.cor;
+
+import com.example.tankbattle.Bullet;
+import com.example.tankbattle.GameObject;
+import com.example.tankbattle.Tank;
+
+public class BulletTankCollider implements Collider {
+
+
+    @Override
+    public boolean collide(GameObject o1, GameObject o2) {
+        if (o1 instanceof Bullet && o2 instanceof Tank) {
+            Bullet bullet = (Bullet) o1;
+            Tank t = (Tank) o2;
+            if (bullet.collideWith(t)){
+                return false;
+            } else {
+                return true;
+            }
+        } else if (o1 instanceof Tank && o2 instanceof Bullet) {
+            return collide(o2, o1);
+        } else {
+            return true;
+        }
+    }
+}
diff --git a/src/main/java/com/example/tankbattle/cor/Collider.java b/src/main/java/com/example/tankbattle/cor/Collider.java
new file mode 100644
index 0000000..a78be63
--- /dev/null
+++ b/src/main/java/com/example/tankbattle/cor/Collider.java
@@ -0,0 +1,7 @@
+package com.example.tankbattle.cor;
+
+import com.example.tankbattle.GameObject;
+
+public interface Collider {
+    boolean collide(GameObject o1, GameObject o2);
+}
diff --git a/src/main/java/com/example/tankbattle/cor/ColliderChain.java b/src/main/java/com/example/tankbattle/cor/ColliderChain.java
new file mode 100644
index 0000000..e513a43
--- /dev/null
+++ b/src/main/java/com/example/tankbattle/cor/ColliderChain.java
@@ -0,0 +1,30 @@
+package com.example.tankbattle.cor;
+
+import com.example.tankbattle.GameObject;
+
+import java.util.LinkedList;
+import java.util.List;
+
+public class ColliderChain implements Collider {
+
+    private List<Collider> colliders = new LinkedList<>();
+
+    public ColliderChain() {
+        add(new BulletTankCollider());
+        add(new TankTankCollider());
+    }
+
+    public void add(Collider c) {
+        colliders.add(c);
+    }
+
+    @Override
+    public boolean collide(GameObject o1, GameObject o2) {
+        for (int i = 0; i < colliders.size(); i++) {
+            if (!colliders.get(i).collide(o1, o2)) {
+                return false;
+            }
+        }
+        return true;
+    }
+}
diff --git a/src/main/java/com/example/tankbattle/cor/TankTankCollider.java b/src/main/java/com/example/tankbattle/cor/TankTankCollider.java
new file mode 100644
index 0000000..08ae70f
--- /dev/null
+++ b/src/main/java/com/example/tankbattle/cor/TankTankCollider.java
@@ -0,0 +1,21 @@
+package com.example.tankbattle.cor;
+
+import com.example.tankbattle.GameObject;
+import com.example.tankbattle.Tank;
+
+public class TankTankCollider implements Collider {
+
+
+    @Override
+    public boolean collide(GameObject o1, GameObject o2) {
+        if (o1 instanceof Tank && o2 instanceof Tank) {
+            Tank t1 = (Tank) o1;
+            Tank t2 = (Tank) o2;
+            if ( t1.getRect().intersects(t2.getRect())){
+                t1.stop();
+//                t2.stop();
+            }
+        }
+        return true;
+    }
+}
diff --git a/src/main/resources/Config.properties b/src/main/resources/Config.properties
index 8f8ef51..c0dab71 100644
--- a/src/main/resources/Config.properties
+++ b/src/main/resources/Config.properties
@@ -5,5 +5,7 @@ bulletSpeed=10
 gameWidth=1080
 gameHeight=720
 #fireStrategy
-goodFS=com.example.tankbattle.FourDirFireStrategy
-badFS=com.example.tankbattle.DefaultFireStrategy
\ No newline at end of file
+goodFS=com.example.tankbattle.strategy.FourDirFireStrategy
+badFS=com.example.tankbattle.strategy.DefaultFireStrategy
+#colliders
+colliders=com.example.tankbattle.cor.BulletTankCollider,com.example.tankbattle.cor.TankTankCollider
\ No newline at end of file