You can apply for a business visa to China from Chinese embassy. The requirements are as follows:
1. original passport valid for more than 6 months with at least 2 visa pages left.
2. application form for China with a passport sized photo stuck to it.
3. invitation letter from China your business partner.
But if you do not have one from China can provide you the invitation letter, you can apply for a tourist visa instead (DO NOT mention your business purpose to China to the application form in this regards), the requirements are listed above on this page.