I am Bangladeshi Citizen. Now I live in Italy. I got residence permit. How can i apply for tourist?

You need to prepare following documents for China visa:
1. Original passport remaining to be valid for at least six months from the date of application and with sufficient blank visa pages.
2. Completed Visa Application Form (Both V2011A and V2011B) with a recently-taken passport photo stuck on it; make sure fill in the visa application form in detail.
3. The round-trip flight reservation and the hotel reservation in China.
4. The original and a copy of permanent residence permit which should be valid for at least half a year.