I need a visa for bisiness in china.what is the procedure

First, you should prepare the required documents including passport and copy of its data page, the application form, a passport-style photo, an invitation letter of a duly authorized unit, an invitation letter from your business partner.
Next, go to the embassy between 15:00 and 17:00 every Tuesday and Thursday to make an appointment for face-to-face interview and submit the application.