diff --git a/lesson7-diy4.py b/lesson7-diy4.py
new file mode 100644
index 0000000..c9c32cd
--- /dev/null
+++ b/lesson7-diy4.py
@@ -0,0 +1,75 @@
+import pygame
+from pygame import locals
+import random
+
+pygame.init()  # 初始化
+# 创建一个窗口
+screen = pygame.display.set_mode((1000, 600))
+FPS = pygame.time.Clock()  # pygame时钟，控制游戏速度（帧数）
+pygame.display.set_caption("悟空酷跑")
+# 载入图片
+background = pygame.image.load('bg.png')    # 背景
+road = pygame.image.load('road.png')      # 路
+stone = pygame.image.load('stone.png')      # 石头
+cacti = pygame.image.load('cacti.png')      # 仙人掌
+bush = pygame.image.load('bush.png')      # 灌木丛
+hero = [pygame.image.load('hero1.png'),
+        pygame.image.load('hero2.png'),
+        pygame.image.load('hero3.png'),
+        pygame.image.load('hero4.png'),
+        pygame.image.load('hero5.png')]
+index = 0   
+y = 400
+jumpState = "runing"
+t = 30
+obstacle = random.choice([bush, stone, cacti])
+rect = obstacle.get_rect()
+rect.x = 1000
+rect.y = 500 - rect.height
+
+while True:
+    for event in pygame.event.get():
+        if event.type == locals.QUIT:
+            # 接收到退出事件后退出程序
+            exit()
+        if event.type == locals.KEYDOWN:
+            if jumpState == "runing":
+                if event.key == locals.K_SPACE:
+                    jumpState = "up"
+
+    if jumpState == "up":    # 起跳状态
+        if t > 0:
+            y -= t
+            t -= 2
+        else:
+            jumpState = "down"  
+    if jumpState == "down":    # 降落状态
+        if t <= 30:
+            y += t
+            t += 2
+        else:
+            jumpState = "runing"
+            t =30
+    
+    # 悟空造型
+    wukong = hero[index]
+    if jumpState == "runing":       # 跑步状态下
+        index += 1
+        if index >= 5:
+            index = 0
+    # 将背景图画上去
+    screen.blit(background, (0, 0))     # 远处背景
+    screen.blit(road, (0, 500))     # 路
+    screen.blit(wukong, (150, y))     # 悟空
+
+    if rect.x <= 0-rect.width:      # 障碍物消失
+        # 创建障碍物对象
+        obstacle = random.choice([bush,stone,cacti])
+        rect = obstacle.get_rect()
+        rect.x = 1000
+        rect.y = 500 - rect.height
+    rect.x -= 8
+    screen.blit(obstacle, (rect.x, rect.y)) 
+    # 刷新画面
+    pygame.display.update()
+    FPS.tick(30)
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