diff --git a/bullet.py b/bullet.py
new file mode 100644
index 0000000..3deba69
--- /dev/null
+++ b/bullet.py
@@ -0,0 +1,31 @@
+import pygame
+from pygame.sprite import Sprite
+import time
+
+class Bullet(Sprite):
+    '''飞船子弹进行管理'''
+
+    def __init__(self,ai_settings,screen,ship):
+        super(Bullet,self).__init__()
+        self.screen = screen
+
+        # 创建子弹矩形初始位置（0,0,3,15）分别对应lef，top，宽，高
+        self.rect = pygame.Rect(0,0,
+        ai_settings.bullet_width, ai_settings.bullet_height)
+
+        self.rect.centerx = ship.rect.centerx  # 设置中心点x轴坐标跟飞船一致
+        self.rect.top = ship.rect.top          # 设置y轴坐标顶部跟飞船一致
+
+        # 设置成小数进行计算
+        self.top = float(self.rect.top)
+
+        self.color = ai_settings.bullet_color
+        self.speed_factor = ai_settings.bullet_speed_factor
+
+    def update(self):
+        self.top -=self.speed_factor
+        self.rect.top = self.top
+        print(self.rect.top)
+
+    def draw_bullet(self):
+        pygame.draw.rect(self.screen,self.color,self.rect)
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