diff --git a/src/com/msb/Tank.java b/src/com/msb/Tank.java
index 0ea3832..cd8bdb8 100644
--- a/src/com/msb/Tank.java
+++ b/src/com/msb/Tank.java
@@ -71,13 +71,12 @@ public class Tank {
             default: break;
         }
 
-//        this.boundsCheck();
-
         //敌方坦克随机发射炮弹
         if(this.group == GroupEnum.BAD && random.nextInt(100) > 95) this.fire();
         //敌方坦克随机改变方向进行
         if(this.group == GroupEnum.BAD && random.nextInt(100) > 95) this.randomDir();
 
+        this.boundsCheck();
     }
 
     public void randomDir() {
@@ -96,9 +95,10 @@ public class Tank {
     }
 
     public void boundsCheck() {
-        if(x<0 || y<0 || x>TankFrame.GAME_WIDTH || y>TankFrame.GAME_HEIGHT) {
-            this.setDir(DirEnum.valueOf(random.nextInt(30)%4));
-        }
+        if(this.x < 2) this.x = 2;
+        if(this.x > TankFrame.GAME_WIDTH-Tank.WIDTH-2) this.x = TankFrame.GAME_WIDTH-Tank.WIDTH-2;
+        if(this.y < 28) this.y = 28;    //因为窗口顶上有菜单栏的高度
+        if(this.y > TankFrame.GAME_HEIGHT-Tank.HEIGHT-2) this.y = TankFrame.GAME_HEIGHT-Tank.HEIGHT-2;
     }
 
     public int getX() {