Rules for getting a type Z china visa
If you are working in China without a work (Z) visa, it's time to get one. To get a Z visa, you must be employed by a registered company, undergo medical tests, be graduated for two years and provide recommendation letters from previous employers. The main thing they are looking for in granting Z visas is that you are a specialist in your field and very much needed by your company for a position that could not be filled locally. These days, it's looking like you have to go back to their home country to get Z visas. While companies were once able to get Z visas for newly hired employees on F visas, now you have to go home to get one.

