diff --git a/src/com/msb/Bullet.java b/src/com/msb/Bullet.java
index 3c6dd49..5bc66f8 100644
--- a/src/com/msb/Bullet.java
+++ b/src/com/msb/Bullet.java
@@ -8,12 +8,12 @@ import java.awt.*;
  * @Description: 子弹类
  * @Version: 1.0
  */
-public class Bullet extends Frame {
+public class Bullet {
 
     private int x, y;
     private DirEnum dir;
-    public static final int WIDTH = 20;
-    public static final int HEIGHT = 20;
+    public static final int WIDTH = ResourcesMgr.bulletD.getWidth();
+    public static final int HEIGHT = ResourcesMgr.bulletD.getHeight();
     public static final int SPEED = 5;
     private boolean live = true;
     private TankFrame tankFrame;
diff --git a/src/com/msb/Tank.java b/src/com/msb/Tank.java
index 7819564..2f32cdf 100644
--- a/src/com/msb/Tank.java
+++ b/src/com/msb/Tank.java
@@ -16,6 +16,8 @@ public class Tank {
     private boolean move = false;
     //为了解决能够在坦克中发射子弹，将创建的子弹通过坦克发射出来，那么需要在坦克类中持有游戏窗口的引用
     private TankFrame tankFrame;
+    public static final int WIDTH = ResourcesMgr.tankD.getWidth();
+    public static final int HEIGHT = ResourcesMgr.tankD.getHeight();
 
     public Tank(int x, int y, DirEnum dir, TankFrame tankFrame) {
         this.x = x;
@@ -62,6 +64,8 @@ public class Tank {
     }
 
     public void fire() {
-       tankFrame.bullets.add(new Bullet(this.x, this.y, this.dir, tankFrame));
+        int bX = this.x + WIDTH/2 - Bullet.WIDTH/2;
+        int bY = this.y+HEIGHT/2-Bullet.HEIGHT/2;
+        tankFrame.bullets.add(new Bullet(bX, bY, this.dir, tankFrame));
     }
 }