I am a Chinese teacher and want to apply for in-service graduate students. Can I only apply for academic qualifications and not literature? How to find out which school has which major?

As long as you get a bachelor's degree, there are no professional restrictions on applying for graduate students. You can even apply for graduate students in science and engineering, not to mention literature. If you want to know what master's programs are available in each school, you can log on to the graduate websites of each school, and the enrollment brochures are clearly written! Good luck!