Set X11 Forwarding for gitk

Tools: Xshell, Xming, git
1) Install Xming. Run it.
2) Xshell setting: Connection->SSH->Tunneling, click Forwarding X11 connection to X DISPALY:(localhost 0.0);
3) ssh to you server, test X11 by command 'xclock &'; if X11 is set properly, then a clock would appear in you local desk.
4) install git (gitk is installed by default).
5) goto a git repo, type in command 'gitk &'; the GUI would come out automatically as :