dear sir i am afghan citizen I have a bussines passport how i can get a bussines visa to china?

If you come to PRC for the first time, you are required to provide these documents:
1.Passport. It should be valid for more than six months and have two blank pages at least.
2.Filled 2013 application form. Hand-written ones are not accepted anymore.
3.A recent passport size photo.
4.The invitation letter from duly authorized Chinese unit or organization.
5.Guarantee letter from the travel agency of Afghanistan.
6.Business license (original and copy versions)
7.A paper with your current address (both original and translated versions)
8.Bank savings (more than 4000 USD)
9.Non-criminal record certified by your foreign affairs ministry (both original and copy versions)
10.Round trip air tickets. The destination must be the same as the destination in the invitation letter.

If you came to PRC in last five years, you just need to provide documents mentioned in 1, 2, 3, 4 and 5.