diff --git a/src/Viewer/fg_os_osgviewer.cxx b/src/Viewer/fg_os_osgviewer.cxx
index 198bbfb..a1adf98 100755
--- a/src/Viewer/fg_os_osgviewer.cxx
+++ b/src/Viewer/fg_os_osgviewer.cxx
@@ -147,6 +147,7 @@ static void setStereoMode(const char* mode)
         cmode = fgGetString("/sim/current-view/name", "飞行员");
         SG_LOG(SG_VIEW, SG_INFO, "当前视角: " << cmode);
 
+        fgSetFloat("/sim/rendering/osg-displaysettings/screen-distance",30);
 
         if ( cmode =="飞行员"  || cmode == "副驾驶" || cmode== "领航"  || cmode== "货仓" || cmode== "") {
             fgSetFloat("/sim/rendering/osg-displaysettings/screen-distance",0.6);