how to get Business visa , requirements,how long to get it and cost to China

It takes four to five working days to process your application. If you plan to work in China, you need to apply for a Z type one instead of F. You need to provide: your passport (valid for six months at least and with two blank pages), a filled application form affixed with your recent passport size photo, invitation letter of duly authorized unit and work permit.

Thanks so much for ur reply,do the invitation letter duly authorized and work permit are from Ministry of labor in Chinese ?

yes, you are right.