diff --git a/simulators/ursina_simulator.py b/simulators/ursina_simulator.py
index 6cbd0c1759fbf9c4fb63d77f38dd10bacd4a0cd8..96aad37d20b1cc4995dcdabbe391587b9f4db129 100644
--- a/simulators/ursina_simulator.py
+++ b/simulators/ursina_simulator.py
@@ -276,6 +276,7 @@ class UrsinaSimulator(Simulator):
         # 防止打开中文输入法
         # self.switch_to_english_input_method()
         audio = Audio('../sounds/universe_04.mp3', pitch=1, loop=True, autoplay=True)
+        audio.volume = 0.3
         self.app.run()