diff --git a/docs/坦克大战笔记.docx b/docs/坦克大战笔记.docx
index 447d4ab..f569b2f 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/course9/DefaultFireStrategy.java b/src/com/demo/tank/course9/DefaultFireStrategy.java
index 6e6eb4f..49169f2 100644
--- a/src/com/demo/tank/course9/DefaultFireStrategy.java
+++ b/src/com/demo/tank/course9/DefaultFireStrategy.java
@@ -8,13 +8,13 @@ public class DefaultFireStrategy implements FireStrategy {
     public void fire(Tank tank) {
         int bx = tank.getX() + Tank.WIDTH / 2 - Bullet.WIDTH / 2;
         int by = tank.getY() + Tank.HEIGHT / 2 - Bullet.HEIGHT / 2;
-//        new Bullet(bx, by, tank.getDir(), tank.getGroup());
+        new Bullet(bx, by, tank.getDir(), tank.getGroup());
 //        GameModel.getInstance().add(new RectDecorator(new Bullet(bx, by, tank.getDir(), tank.getGroup())));
-        GameModel.getInstance().add(new RectDecorator(
-                new TailDecorator(
-                        new Bullet(bx, by, tank.getDir(), tank.getGroup())
-                )
-        ));
+//        GameModel.getInstance().add(new RectDecorator(
+//                new TailDecorator(
+//                        new Bullet(bx, by, tank.getDir(), tank.getGroup())
+//                )
+//        ));
         if (tank.getGroup() == Group.GOOD) new Thread(() -> new Audio("audio/tank_fire.wav").play()).start();
     }
 }
diff --git a/src/com/demo/tank/course9/Tank.java b/src/com/demo/tank/course9/Tank.java
index 0ba0019..412886d 100644
--- a/src/com/demo/tank/course9/Tank.java
+++ b/src/com/demo/tank/course9/Tank.java
@@ -5,6 +5,9 @@ import com.demo.tank.enums.Group;
 import com.demo.tank.util.ResourceManager;
 
 import java.awt.*;
+import java.sql.Timestamp;
+import java.time.Instant;
+import java.util.Arrays;
 import java.util.Random;
 
 public class Tank extends GameObject {
@@ -124,6 +127,14 @@ public class Tank extends GameObject {
         fireStrategy.fire(this);
     }
 
+    public void handleFireKey(){
+        java.util.List<TankFireObserver> observers = Arrays.asList(new TankFireHandler());
+        TankEvent event = new TankEvent(Timestamp.from(Instant.now()), this);
+        for (TankFireObserver o : observers){
+            o.actionOnFire(event);
+        }
+    }
+
     public void die() {
         this.living = false;
     }
diff --git a/src/com/demo/tank/course9/TankEvent.java b/src/com/demo/tank/course9/TankEvent.java
new file mode 100644
index 0000000..da23fc9
--- /dev/null
+++ b/src/com/demo/tank/course9/TankEvent.java
@@ -0,0 +1,21 @@
+package com.demo.tank.course9;
+
+import java.sql.Timestamp;
+
+public class TankEvent {
+    private Timestamp timestamp;
+    private Tank source;
+
+    public TankEvent(Timestamp timestamp, Tank source) {
+        this.timestamp = timestamp;
+        this.source = source;
+    }
+
+    public Timestamp getTimestamp() {
+        return timestamp;
+    }
+
+    public Tank getSource() {
+        return source;
+    }
+}
diff --git a/src/com/demo/tank/course9/TankFireHandler.java b/src/com/demo/tank/course9/TankFireHandler.java
new file mode 100644
index 0000000..331d69d
--- /dev/null
+++ b/src/com/demo/tank/course9/TankFireHandler.java
@@ -0,0 +1,10 @@
+package com.demo.tank.course9;
+
+public class TankFireHandler implements TankFireObserver{
+    @Override
+    public void actionOnFire(TankEvent event) {
+        Tank tank = event.getSource();
+        System.out.println("my tank fire time: " + event.getTimestamp());
+        tank.fire();
+    }
+}
diff --git a/src/com/demo/tank/course9/TankFireObserver.java b/src/com/demo/tank/course9/TankFireObserver.java
new file mode 100644
index 0000000..c5a164a
--- /dev/null
+++ b/src/com/demo/tank/course9/TankFireObserver.java
@@ -0,0 +1,5 @@
+package com.demo.tank.course9;
+
+public interface TankFireObserver {
+    void actionOnFire(TankEvent event);
+}
diff --git a/src/com/demo/tank/course9/TankFrameV9.java b/src/com/demo/tank/course9/TankFrameV9.java
index 29d4a9f..1ff669e 100644
--- a/src/com/demo/tank/course9/TankFrameV9.java
+++ b/src/com/demo/tank/course9/TankFrameV9.java
@@ -90,7 +90,7 @@ public class TankFrameV9 extends Frame {
                     bD = false;
                     break;
                 case KeyEvent.VK_SPACE:
-                    gm.tank.fire();
+                    gm.tank.handleFireKey();
                     break;
                 default:
                     break;