diff --git a/src/com/msb/Tank.java b/src/com/msb/Tank.java
index 74ba32f..8efc0c6 100644
--- a/src/com/msb/Tank.java
+++ b/src/com/msb/Tank.java
@@ -13,6 +13,7 @@ public class Tank {
     private int x,y;
     private DirEnum dir;
     private static final int SPEED = 10;
+    private boolean move = false;
 
     public Tank(int x, int y, DirEnum dir) {
         this.x = x;
@@ -22,6 +23,16 @@ public class Tank {
 
     public void paint(Graphics g) {
         g.fillRect(x, y, 50, 50);
+        moving();
+    }
+
+    public void setDir(DirEnum dir) {
+        this.dir = dir;
+    }
+
+    public void moving() {
+
+        if( ! move) return;
 
         switch (dir) {
             case UP: y -= SPEED; break;
@@ -30,9 +41,10 @@ public class Tank {
             case RIGHT: x += SPEED; break;
             default: break;
         }
+
     }
 
-    public void setDir(DirEnum dir) {
-        this.dir = dir;
+    public void setMove(boolean move) {
+        this.move = move;
     }
 }
diff --git a/src/com/msb/TankFrame.java b/src/com/msb/TankFrame.java
index eb100e6..271aeae 100644
--- a/src/com/msb/TankFrame.java
+++ b/src/com/msb/TankFrame.java
@@ -72,10 +72,17 @@ public class TankFrame extends Frame {
                 case KeyEvent.VK_DOWN : bD = false; break;
                 default: break;
             }
-//            setDir(); //通过做了实验，现阶段就算不用这个方法，也不影响，但是按键抬起，坦克应该停止，如果还按照原来的方向移动就不对了
+            setDir();
         }
 
         private void setDir() {
+            //当没有任何方向键按下的时候，那么让坦克停止
+            if( !bL && !bR && !bU && !bD ) {
+                tank.setMove(false);
+            } else {
+                tank.setMove(true);
+            }
+
             //为什么不用if-else 因为有可能是一起按两个方向键，那最后拿到哪个算哪个
             if(bL) tank.setDir(DirEnum.LEFT);
             if(bR) tank.setDir(DirEnum.RIGHT);