diff --git a/mutiplPicMove.py b/mutiplPicMove.py
new file mode 100644
index 0000000..11a11a4
--- /dev/null
+++ b/mutiplPicMove.py
@@ -0,0 +1,52 @@
+import pygame,sys
+from random import *
+class myBallClass(pygame.sprite.Sprite):
+    def __init__(self,image_file,location,speed):
+        pygame.sprite.Sprite.__init__(self)
+        self.image = pygame.image.load(image_file)
+        self.rect = self.image.get_rect()
+        self.rect.left,self.rect.top = location
+        self.speed = speed
+    def move(self):
+        self.rect = self.rect.move(self.speed)
+        if self.rect.left < 0 or self.rect.right > width:
+            self.speed[0] = - self.speed[0]
+        if self.rect.top < 0 or self.rect.bottom > height:
+            self.speed[1] = - self.speed[1]
+
+def animate(group):
+    screen.fill([255,255,255])
+    for ball in group:
+        ball.move()
+    for ball in group:
+        group.remove(ball)
+        if pygame.sprite.spritecollide(ball,group,False):
+            ball.speed[0] = - ball.speed[0]
+            ball.speed[1] = - ball.speed[1]
+        group.add(ball)
+        screen.blit(ball.image,ball.rect)
+
+    pygame.display.flip()
+    # pygame.time.delay(20)
+
+
+size = width,height = 640,480
+screen = pygame.display.set_mode(size)
+screen.fill([255,255,255])
+img_file = "./bg_img/no.png"
+clock = pygame.time.Clock()
+group = pygame.sprite.Group()
+for row in range(0,2):
+    for column in range(0,2):
+        location = [column * 180 + 10,row * 180 + 10]
+        speed = [choice([-2,2]),choice([-2,2])]
+        ball = myBallClass(img_file,location,speed)
+        group.add(ball)
+while True:
+    for event in pygame.event.get():
+        if event.type == pygame.QUIT:
+            frame_rate = clock.get_fps()
+            print "frame_rate = ",frame_rate
+            sys.exit()
+    animate(group)
+    clock.tick(30)
diff --git a/singlePicMove.py b/singlePicMove.py
new file mode 100644
index 0000000..e69de29