I wanna add some Chinese characters at the forum title of each page, but all these characters are mingled badly. I tried to change the character encoding scheme of my browser, but it did not work. Please help me resolve the problem, thanks!

First of all, let us know how did you try to implement this? Editing what file?

Forum's generic title is defined under setup_options.php - $sitename var. You must be sure you are editing this file in the same encoding as your forums are set up.

I am now half undestood...
I edit php files via notepad++, so what should I do?

Thanks!

Try Notepad2.