if you can control it as your a native speaker, you can teach it in various language center, but they ask teaching experience, and then it is not true that you can earn a lot (i am an italian native speaker and i am teaching italian in a center, the salary is really awful)
you can work as translator and interpreter, but this kind of job requires certificate (knowing well 2 languages doesn't mean that you can translate)
as tourist guide, but also this job requires experience
the most probable is working for a french company in hk, it depends on what it is your educational background and your luck
naturally, if you can go to france, your knowledge of french would be more appreciated, because you also know chinese
2007-01-16 14:20:48 補充:
look for someone who wants to learn french with private lesson, it is much more profitable than teaching in a center