diff --git a/my_Tetris.py b/my_Tetris.py
index 8711234..06e2697 100644
--- a/my_Tetris.py
+++ b/my_Tetris.py
@@ -1,6 +1,6 @@
 import pygame
 from pygame import locals
-
+import random
 pygame.init()   # 初始化
 score = 0
 grid_size = 20  # 格子大小
@@ -43,24 +43,33 @@ cube_colors = [
     (204, 153, 153), (102, 102, 153),(153, 0, 102), 
     (255, 204, 0), (204, 0, 51),(255, 0, 51), (0, 102, 153),
     (153, 0, 51), (204, 255, 102), (255, 153, 0)]
-
+color=random.choice(cube_colors)
 center = [2, 8]     # 第2行第8列
 current_shape = [(0, -1), (0, 0), (0, 1), (-1, 0)]
-
+current_x=random.choice(shape_list)
+current_shape=random.choice(current_x)
+def ceck(cent):
+    for cube in current_shape:
+        cube=(cube[0]+cent[0],cube[1]+cent[1])
+        if cube[0]<1 or cube[1]<1 or cube[0]>grid_num_height or cube[1]>grid_num_width:
+            return False
 while True:
     for event in pygame.event.get():
         if event.type == locals.QUIT:
             exit()
         if event.type == locals.KEYDOWN:
             if event.key == locals.K_RIGHT:     # 向右
-                if center[1] < 15:
                     center[1] += 1
+                    if ceck(center)==False:
+                        center[1] -= 1
             elif event.key == locals.K_LEFT:    # 向左
-                if center[1] > 1:
+                center[1] -= 1
+                if ceck(center)==False:
+                    center[1] += 1
+            elif event.key == locals.K_DOWN:    # 向
+                center[0] += 1
+                if ceck(center)==False:
                     center[1] -= 1
-            elif event.key == locals.K_DOWN:    # 向下
-                if center[0] < 25:
-                    center[0] += 1
 
     # 将背景图画上去
     screen.blit(background, (0, 0))