Candidates with english as mother tongue are prefered
That's what the job description says even if there are two mistakes in it.
To get a Chinese ATPL you will have to do an English Comprehension Test. I would imagine, like colleges requiring English speaking teachers, that they would demand a native English speaker. You can, of course, have a read of this thread.
http://www.pprune.org/south-asia-far...structors.html