diff --git a/snake.py b/snake.py
index 0a583c9..1422cd7 100644
--- a/snake.py
+++ b/snake.py
@@ -17,12 +17,13 @@ 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
-
+myfont=pygame.font.Font('neuropol.ttf',18)
 x, y = 240, 120
 position = [(180, 90), (180, 120), (210, 120), (x, y)]
 
 setheading = "right"
 snake_head = right
+score=0
 a_x,a_y=360,300
 while True:
     for event in pygame.event.get():
@@ -53,10 +54,18 @@ while True:
     else:
         y += 30
     position.append((x, y))
-    position.pop(0)
+    
     if x==a_x and y==a_y:
-        a_x=random.
-
+        a_x=random.randint(0,21)*30
+        a_y=random.randint(0,15)*30
+        score+=1
+    else:
+        position.pop(0)
+    if x<0 or x>630 or y<0 or y>450:
+        exit()
+    for i,j in position[:-1]:
+        if x==i and y==j:
+            exit()
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
@@ -67,6 +76,9 @@ while True:
 
     # 将果实画上去
     screen.blit(food, (a_x, a_y))
+
+    text=myfont.render('Score:'+str(score),True,(0,0,0))
+    screen.blit(text,(540,10))
     # 刷新画面
     pygame.display.update()
     FPSCLOCK.tick(3)
\ No newline at end of file