diff --git a/my_Tetris.py b/my_Tetris.py
index 0eef9fb..aa6e87f 100644
--- a/my_Tetris.py
+++ b/my_Tetris.py
@@ -54,7 +54,13 @@ def check(center):
         if cube[0] < 1 or cube[1] < 1 or cube[0] > grid_num_height \
                 or cube[1] >grid_num_width:
             return False
+        if num_list[cube[0]-1][cube[1]-1] !=0:
+            return False
 
+num_list=[]
+for i in range(25):
+    num_list.append([0]*15)
+    
 while True:
     for event in pygame.event.get():
         if event.type == locals.QUIT:
@@ -97,7 +103,10 @@ while True:
         center[0] = center[0] + 1
         if check(center) == False:
             center[0] = center[0] - 1      
-            states = False      
+            states = False
+            for cube in current_pos:
+                num_list[cube[0]-1][cube[1]-1]=color
+
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 计算出所有小方块的行、列位置