As a general rule of thumb only, Moderators are normally picked from among PPRuNers who have been on these bulletin boards for a number of years, have a depth of experience commensurate with the forums on which they moderate, frequently are already known personally to the Administrators, (though this is not always the case), and are people who have the energy and time to spend many hours ploughing through the forums.
The quality of their posts will have some bearing on whether they are picked or not to be a moderator. In my case I had been registered with PPRuNe for seven years before being selected.
Of course there is a bit more to it than that, an ability to remain objective, not get involved in arguments or take sides in any way, recognise when a post is irrelevant, off-topic, insulting or has the potential to be libellous etc., to name but a few.
Hong Xing first registered in July 2003 and has so far made eight posts, it will be up to the Administrators of PPRuNe to make all and any decisions regarding a Chinese language forum.
BlueEagle - Moderator.