i am Ali imam from India. I want to know what document required for china visa as tour.

The basic documents are your passport, finished application form and a recent passport photo. And you should also provide these documents:
1. round-trip air tickets and hotel booking.
2. invitation letter from mainland China. If you have this, air tickets and hotel bookings are not required.
3. an introduction letter, including where you are going, who invites you, employment proof or recent six months bank statement.