diff --git a/Dockerfile b/Dockerfile
index 10ba305..ff2c28a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,11 +1,9 @@
 FROM ubuntu:14.04
 
 RUN apt-get update \
-    && apt-get install -y wget firefox lxde-core lxterminal tightvncserver
-ENV VNCPWD=xiaosong
-RUN && mkdir ~/.vnc \
-    && echo $VNCPWD $VNCPWD | vncpasswd && \
-    && wget http://fpdownload.macromedia.com/get/flashplayer/pdc/11.2.202.635/install_flash_player_11_linux.x86_64.tar.gz \
+    && apt-get install -y wget firefox xfce4 vnc4server
+ENV DISPLAY=":1" VNC_COL_DEPTH=24 VNC_RESOLUTION=1280x800 VNC_PW=xiaosong
+RUN wget http://fpdownload.macromedia.com/get/flashplayer/pdc/11.2.202.635/install_flash_player_11_linux.x86_64.tar.gz \
     && mkdir flash_player \
     && tar zxvf install_flash_player_11_linux.x86_64.tar.gz -C flash_player \
     && mkdir -p ~/.mozilla/plugins/ \
diff --git a/vnc.sh b/vnc.sh
index 460b024..ff30315 100644
--- a/vnc.sh
+++ b/vnc.sh
@@ -1,6 +1,10 @@
 #!/bin/bash
 
-# Remove VNC lock (if process already killed)
-rm /tmp/.X1-lock /tmp/.X11-unix/X1
-# Run VNC server with tail in the foreground
-vncserver :1 -geometry 1280x800 -depth 24 && tail -F /root/.vnc/*.log
\ No newline at end of file
+##change vnc password
+echo "change vnc password!"
+(echo $VNC_PW && echo $VNC_PW) | vncpasswd
+
+##start vncserver
+vncserver -kill :1 && rm -rfv /tmp/.X* ; echo "remove old vnc locks to be a reattachable container"
+vncserver $DISPLAY -depth $VNC_COL_DEPTH -geometry $VNC_RESOLUTION
+sleep 1
\ No newline at end of file