yum install tigervnc-server
vim /etc/sysconfig/vncservers
View the configuration file and modify the last two lines of configuration file parameters as follows:
VNCSERVERS="1:root"
VNCSERVERARGS[2]="-geometry 1360x768 -nolisten tcp -localhost"
source /etc/sysconfig/vncservers
vncserver
vim /root/.vnc/xstartup
Just change the last sentence twm & to gnome-session &
service vncserver restart