diff --git a/usr/lib/sonist/window.py b/usr/lib/sonist/window.py
index 36fc275..e8668ab 100644
--- a/usr/lib/sonist/window.py
+++ b/usr/lib/sonist/window.py
@@ -37,14 +37,14 @@ class SonistWindow(Gtk.Window):
     self.css_provider = None
     self.set_default_style()
 
-    self.set_decorated(False)
+    self.set_position(Gtk.WindowPosition.CENTER)
+    self.set_decorated(False) # 隐藏系统标题栏
     self.set_name('SonistWindow')
     self.set_title('Sonist')
     self.set_default_size(320, 384)
     self.set_resizable(False)
     self.set_wmclass('Sonist', 'Sonist')
 
-    self.set_opacity(0.9)
     self.set_background_image(image_dict['disk'])