i want go to from india to china as business tour, can you tell me the procedure for visa apply?

Generally speaking, you need to follow three steps. First, prepare all the materials you may use, like your passport and its copy, application form, passport-style photo, and an invitation letter from your trade partner in PRC, etc. Second, go to the designated office in Saudi Arabia to submit the application if you plan to apply from there. Last, go and get your passport back on the appointed date.