What are the process to go China for business purpose?

You need to prepare following documents for application, you can apply either in person or by someone else or an agency entrusted:
1. Application Form with a recently-taken color photo glued to.
2. Valid passport and a copy of information page.
3. One of the following documents: invitation letter, Confirmation Letter of Invitation (with the invitation letter attached) or conference notice issued by Chinese units, Chinese citizens or duly authorized Chinese institute.
4. Personal written statement (covering letter with details as follows: place to visit, name, address and contact number of the inviting / contact company or person).