How to make Debian support Chinese had already be the FAQ in my mailbox and ICQ history. Indeed, most debian packages already got good chinese support as other distribution. However, several different locale naming schema (Yup, Openi18n is trying to standardize it but it take time) and many other issues makes it is so troublesome that you need to modify many files and I always forget to mark the steps down. While my notebook harddisk is damaged recenlty, I need to do the setup again finally. And answer this FAQ here.
Notice: An updated chinese version was posted in
http://wiki.debian.org.hk/w/Make_Debian_support_Chinese. An english version was also created in http://wiki.debian.org.hk/w/Make_Debian_support_Chinese_(eng) due to many request. Forget every thing below and go to read the updated version.