这主要是vncserver启动时配置错误：
主要是修改配置文件，运行vim /root/.vnc/xstartup ，按如下修改即可
#!/bin/sh
# Uncomment the following two lines for normal desktop:
unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS
# exec /etc/X11/xinit/xinitrc
[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
vncconfig -iconic &
x-terminal-emulator -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
#x-window-manager &
#gnome-session &
x-session-manager & xfdesktop & xfce4-panel &
xfce4-menu-plugin &
xfsettingsd &
xfconfd &
xfwm4 &
修改完成后重启vnc
先停止#vncserver -kill :1 (注意kill后面要有个空格)
再启动#vncserver