It will have some dependance on your experience, qualifications, their needs and how long they were without one, and of course, the hours per week you will be required to teach.

But I can give you a range, say maybe between 12,000 Rmb and 20,000 Rmb per month, plus fringues.

I have not heard of anyone making over 20,000 Rmb per month, but I do know a couple who does.

It depends on part-time or full-time. One school could pay 8000 to 20000 yuan a month. 

Tsinghua University, the "best" university in mainland China only pays 10,000 (max) to its most highly qualified teachers.