diff --git a/my_Tetris.py b/my_Tetris.py
index 8711234..336a47f 100644
--- a/my_Tetris.py
+++ b/my_Tetris.py
@@ -1,5 +1,6 @@
 import pygame
 from pygame import locals
+import random
 
 pygame.init()   # 初始化
 score = 0
@@ -7,7 +8,8 @@ grid_size = 20  # 格子大小
 grid_num_width = 15     # 横向格子数量
 grid_num_height = 25      # 纵向格子数量
 FPS = 30
-
+count=0
+states=False
 # 创建窗口
 screen = pygame.display.set_mode((460, 500))
 pygame.display.set_caption("俄罗斯方块")
@@ -44,23 +46,47 @@ cube_colors = [
     (255, 204, 0), (204, 0, 51),(255, 0, 51), (0, 102, 153),
     (153, 0, 51), (204, 255, 102), (255, 153, 0)]
 
-center = [2, 8]     # 第2行第8列
-current_shape = [(0, -1), (0, 0), (0, 1), (-1, 0)]
-
+center = [2, 8]     # 第2行第8列       索引
+# current_shape = [(0, -1), (0, 0), (0, 1), (-1, 0)]
+shape=random.choice(shape_list)
+index=random.randint(0,len(shape)-1)
+current_shape=shape[index]
+color=random.choice(cube_colors)
+def check(center):
+    for cube in current_shape:
+        cube=(cube[0]+center[0],cube[1]+center[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
-            elif event.key == locals.K_LEFT:    # 向左
-                if center[1] > 1:
-                    center[1] -= 1
+            if event.key == locals.K_LEFT:    # 向左
+                center[1]=center[1]-1
+                if check(center)==False:
+                    center[1]=center[1]+1
+
+            elif event.key == locals.K_RIGHT:     # 向右
+                center[1]=center[1]+1
+                if check(center)==False:
+                    center[1]=center[1]-1
+            
             elif event.key == locals.K_DOWN:    # 向下
-                if center[0] < 25:
-                    center[0] += 1
+                center[0]=center[0]+1
+                if check(center)==False:
+                    center[0]=center[0]-1
+            elif event.key==locals.K_UP:
+                old_index=index
+                index+=1
+                if index>=len(shape):
+                    index=0
+                current_shape=shape[index]
+                if check(center)==False:
+                    index = old_index
+                    current_shape=shape[index]
+
 
     # 将背景图画上去
     screen.blit(background, (0, 0))
@@ -71,7 +97,7 @@ while True:
         current_pos.append(pos)
     # 取出所有小方块的行、列位置，计算坐标，绘制俄罗斯方块
     for cube in current_pos:
-        pygame.draw.rect(screen, color,
+        pygame.draw.rect(screen, (255,0,0),
                     (cube[1] * 20-20, cube[0] * 20-20, 20, 20), 0)
         pygame.draw.rect(screen, (255, 255, 255), 
                         (cube[1] * 20-20, cube[0] * 20-20, 20, 20), 1)