diff --git a/extra/wxc2_emsInstall b/extra/wxc2_emsInstall
index 6b9e697..b529213 100644
--- a/extra/wxc2_emsInstall
+++ b/extra/wxc2_emsInstall
@@ -410,7 +410,11 @@ if [ "$installMode" == "2" ] ; then
     # update subdirectory mib, daul.
     cp -rf $srcBinDir/mib/* $dstBinDir/mib
     cp -rf $srcBinDir/dual $dstBinDir/dual
-    chmod +x $dstBinDir/*
+   if [ ! -f "$dstBinDir/conf/tap.cfg" ]; then
+	           cp -f "$srcBinDir/conf/tap.cfg" "$dstBinDir/conf/"
+   fi
+  
+   chmod +x $dstBinDir/*
     myShowResult "OK"
 else
     echo -n "Copy bin files ...."