diff --git a/ship.py b/ship.py
index e02ae43..9b32123 100644
--- a/ship.py
+++ b/ship.py
@@ -27,4 +27,19 @@ class Ship(Sprite):
         self.moving_up = False
         self.moving_down = False
 
-   
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+    def update(self):
+        """根据移动标志调整飞船的位置"""
+        # 更新飞船的center值，而不是rect
+        if self.moving_right and self.rect.right < self.screen_rect.right:
+            self.centerx += self.ai_settings.ship_speed_factor
+        if self.moving_left and self.rect.left > 0:
+            self.centerx -= self.ai_settings.ship_speed_factor
+        if self.moving_up and self.rect.top > 0:
+            self.centery -= self.ai_settings.ship_speed_factor
+        if self.moving_down and self.rect.bottom < self.screen_rect.bottom:
+            self.centery += self.ai_settings.ship_speed_factor
+        # 根据self.center更新rect对象
+        self.rect.centerx = self.centerx
+        self.rect.centery = self.centery
+
+    
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