diff --git a/snake.py b/snake.py
index f4fb40a..5d269d1 100644
--- a/snake.py
+++ b/snake.py
@@ -1,5 +1,6 @@
 import pygame
 from pygame import locals
+import random
 
 # 初始化pygame，为使用硬件做准备
 pygame.init()
@@ -16,13 +17,16 @@ body = pygame.image.load('body.png')        # 身体
 left = pygame.image.load('left.png')        # 头 朝左
 up = pygame.image.load('up.png')            # 头 朝上
 down = pygame.image.load('down.png')        # 头 朝下
+my_font = pygame.font.Font('neuropol.ttf', 18)  # 字体
 
 x, y = 240, 120
 position = [(180, 90), (180, 120), (210, 120), (x, y)]
-apple_x = 360
-apple_y = 300
+apple_x = 360   # 苹果横坐标
+apple_y = 300   # 苹果纵坐标
+
 setheading = "right"
 snake_head = right
+score = 0
 
 while True:
     for event in pygame.event.get():
@@ -53,10 +57,17 @@ while True:
     else:
         y += 30
     position.append((x, y))
-    position.pop(0)
-    if x ==apple_x and y==apple_y:
-        apple_x = random.randint(0,660)
-        apple_y = random.randint(0,480)
+    # 贪吃蛇吃到了苹果
+    if x == apple_x and y == apple_y:
+        num1= random.randint(1, 22)   # 横排第几个格子
+        num2 = random.randint(1, 16)   # 竖排第几个格子
+        apple_x = 30*num1-30   # 苹果的x坐标
+        apple_y = 30*num2-30   # 苹果的y坐标
+    else:
+        position.pop(0)
+    # 贪吃蛇撞墙
+    if x < 0 or x > 630 or y < 0 or y > 450:
+        exit()
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
@@ -67,6 +78,11 @@ while True:
 
     # 将果实画上去
     screen.blit(food, (apple_x, apple_y))
+    # 绘制分数
+    info = "Score:"+ str(score)
+    text = my_font.render(info, True, (0, 0, 0))
+    screen.blit(text, (540, 10))
+
     # 刷新画面
     pygame.display.update()
     FPSCLOCK.tick(3)
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