diff --git a/src/Viewer/fg_os_osgviewer.cxx b/src/Viewer/fg_os_osgviewer.cxx
index b15cd3e..198bbfb 100755
--- a/src/Viewer/fg_os_osgviewer.cxx
+++ b/src/Viewer/fg_os_osgviewer.cxx
@@ -149,9 +149,9 @@ static void setStereoMode(const char* mode)
 
 
         if ( cmode =="飞行员"  || cmode == "副驾驶" || cmode== "领航"  || cmode== "货仓" || cmode== "") {
-            fgSetInt("/sim/rendering/osg-displaysettings/screen-distance",0.6);
+            fgSetFloat("/sim/rendering/osg-displaysettings/screen-distance",0.6);
         } else {
-            fgSetInt("/sim/rendering/osg-displaysettings/screen-distance",30);
+            fgSetFloat("/sim/rendering/osg-displaysettings/screen-distance",30);
         }
 
     }