diff --git a/heroplane.py b/heroplane.py
index 5e87814..354c806 100644
--- a/heroplane.py
+++ b/heroplane.py
@@ -123,4 +123,13 @@ class HeroPlane(object):
                 self.space_key_list.remove(key)
             except Exception:
                 raise
-   
\ No newline at end of file
+    # 按键space不放,持续开火
+
+    def press_fire(self):
+        starttime = pygame.time.get_ticks()
+        passtime = starttime - self.endtime
+
+        if len(self.space_key_list) != 0 and passtime > self.interval:
+            # and passtime >100:
+            self.shot()
+            self.endtime = starttime