diff --git a/docs/坦克大战笔记.docx b/docs/坦克大战笔记.docx
index a5a7408..666b8f0 100644
Binary files a/docs/坦克大战笔记.docx and b/docs/坦克大战笔记.docx differ
diff --git a/src/com/demo/tank/coruse2/Bullet.java b/src/com/demo/tank/coruse2/Bullet.java
index b5581d2..d43266e 100644
--- a/src/com/demo/tank/coruse2/Bullet.java
+++ b/src/com/demo/tank/coruse2/Bullet.java
@@ -17,7 +17,7 @@ public class Bullet {
 
     public void paint(Graphics g){
         Color color = g.getColor();
-        g.setColor(Color.BLACK);
+        g.setColor(Color.RED);
         g.fillOval(x, y, WIDTH, HEIGHT);
         g.setColor(color);
         move();
diff --git a/src/com/demo/tank/coruse2/Tank.java b/src/com/demo/tank/coruse2/Tank.java
index 7f6ee56..5615af9 100644
--- a/src/com/demo/tank/coruse2/Tank.java
+++ b/src/com/demo/tank/coruse2/Tank.java
@@ -6,12 +6,14 @@ public class Tank {
     private Direction dir;
     private static final int SPEED = 10;
     private boolean moving;
+    private TankFrame tankFrame;
 
 
-    public Tank(int x, int y, Direction dir) {
+    public Tank(int x, int y, Direction dir, TankFrame tankFrame) {
         this.x = x;
         this.y = y;
         this.dir = dir;
+        this.tankFrame = tankFrame;
     }
 
     public void paint(Graphics g) {
@@ -70,4 +72,9 @@ public class Tank {
     public void setMoving(boolean moving) {
         this.moving = moving;
     }
+
+    public void fire() {
+        Bullet bullet = new Bullet(x+15, y, this.dir);
+        tankFrame.bullet = bullet;
+    }
 }
diff --git a/src/com/demo/tank/coruse2/TankFrame.java b/src/com/demo/tank/coruse2/TankFrame.java
index 5220bc8..be41f05 100644
--- a/src/com/demo/tank/coruse2/TankFrame.java
+++ b/src/com/demo/tank/coruse2/TankFrame.java
@@ -11,7 +11,7 @@ public class TankFrame extends Frame {
     private static final int GAME_HEIGHT = 600;
     Image image = null;
 
-    Tank tank = new Tank(500, 500, Direction.UP);
+    Tank tank = new Tank(500, 500, Direction.UP, this);
     Bullet bullet = new Bullet(520, 440, Direction.UP);
 
     public TankFrame(){
@@ -35,7 +35,7 @@ public class TankFrame extends Frame {
         }
         Graphics imgGraphic =  image.getGraphics();
         Color color = g.getColor();
-        imgGraphic.setColor(Color.WHITE);
+        imgGraphic.setColor(Color.BLACK);
         imgGraphic.fillRect(0,0, GAME_WIDTH, GAME_HEIGHT);
         imgGraphic.setColor(color);
         paint(imgGraphic);
@@ -90,6 +90,9 @@ public class TankFrame extends Frame {
                 case KeyEvent.VK_S:
                     bD = false;
                     break;
+                case KeyEvent.VK_SPACE:
+                    tank.fire();
+                    break;
                 default:
                     break;
             }