My dear Ms. Cong, I've worked with Chinese teachers in the past. It is the Chinese students natural instinct to listen to the Chinese teacher and disregard the laowai, because the Chinese teacher is easier to understand. The foreigner is basically reduced to being a performing monkey.
I haven't done this at the university level, but I'm guessing it wouldn't be much different.
These days I primarily teach writing, and from what I'm seeing the structure of writing assignments in English is much different than it is Chinese. I don't see how it could be effective to have a Chinese teacher in the classroom.