diff --git a/main.py b/main.py
index 724fc84b006cef4f6f7a992e88f42bbfa72ee8c7..386b0d4ea06494a5afe9607ea8787d4183740290 100644
--- a/main.py
+++ b/main.py
@@ -69,21 +69,33 @@ class Snake(object):
 # 食物类
 # 方法： 放置/移除
 # 点以25为单位
-class Food:
+class Food(object):
     def __init__(self):
         self.rect = pygame.Rect(-25,0,25,25)
         
     def remove(self):
         self.rect.x=-25
     
-    def set(self):
+    def set(self,snake):
         if self.rect.x == -25:
             allpos = []
             # 不靠墙太近 25 ~ SCREEN_X-25 之间
             for pos in range(25,SCREEN_X-25,25):
                 allpos.append(pos)
-            self.rect.left = random.choice(allpos)
-            self.rect.top  = random.choice(allpos)
+            while True:
+                self.rect.left = random.choice(allpos)
+                self.rect.top = random.choice(allpos)
+            
+                # 检查食物位置是否与蛇身体重合
+                overlap = False
+                for segment in snake.body:
+                    if segment.colliderect(self.rect):
+                        overlap = True
+                        break
+            
+                if not overlap:
+                    break
+                    
             print(self.rect)
             
 
@@ -147,7 +159,7 @@ def main():
             snake.addnode()
         
         # 食物投递
-        food.set()
+        food.set(snake)
         pygame.draw.rect(screen,(136,0,21),food.rect,0)
         
         # 显示分数文字