diff --git a/tools/syncext.sh b/tools/syncext.sh
new file mode 100755
index 0000000000..b73773d37e
--- /dev/null
+++ b/tools/syncext.sh
@@ -0,0 +1,62 @@
+#!/bin/bash
+#
+# This shell is used to sync extension files.
+#
+# @author chunsheng wang<chunsheng@cnezsoft.com>
+# @author yidong wang<wangyidong@cnezsoft.com>
+#
+
+# Judge the params, must give $src and $dest.
+if [ $# -lt 2 ]; then
+  echo './syncext.sh src dest'
+  exit 1
+fi
+
+# Judge inotifywait tool exists or not.
+which inotifywait > /dev/null
+if [ $? -ne 0 ]; then
+  echo 'No inotifywait. Please install inotify-tools, for debian or ubuntun run apt-get install inotify-tools.';
+  exit 1
+fi
+
+# Get $src and $dest.
+src=$1/
+dest=$2/
+
+# Rsync when the shell load first. 
+rsync -aqP --exclude='*.svn' $src $dest
+echo `date "+%H:%M:%S"` sync $src to $dest succssfully.
+
+# Watch the $src directory, and sync files to destination.
+inotifywait -mrq --event create,modify,delete,move --format '%w %e %f' --exclude=".svn" $src |\
+while read watcher event file ; do
+
+  # compute the $path2process.
+  path2process=$watcher$file
+  path2process=${path2process/$src/$dest}
+
+  # Delete a file or a directory.
+  if [ "$event" == "DELETE" -o "$event" == "DELETE,ISDIR" ]; then
+
+    # If delete a file, use rm -fr, directory, use rmdir for security.
+    if [ "$event" == "DELETE" ]; then
+      rm -fr $path2process
+    else
+      rmdir $path2process
+    fi
+
+    echo `date "+%H:%M:%S"` $path2process deleted.;
+
+  # If event is ngnored, continue.
+  elif [ "$event" == "IGNORED" ]; then
+
+    continue
+
+  # Sync files.
+  else
+
+    echo `date "+%H:%M:%S"` $path2process copied.
+    rsync -aqP --exclude='*.svn' $src/ $dest
+  fi
+
+done