diff --git a/snake.py b/snake.py
index f12c4fc..a8ba56e 100644
--- a/snake.py
+++ b/snake.py
@@ -55,9 +55,12 @@ while True:
         y += 30
     position.append((x, y))
     if x==apple_x and y ==apple_y:
-        apple_x=random.randint(0,660)
-        apple_y=random.randint(0,480)
-    position.pop(0)
+        num1=random.randint(1,22)
+        num2=random.randint(1,16)
+        apple_x=num1*30-30
+        apple_y=num2*30-30
+    else:
+        position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去