hi, if you have been issued a visa sticker before these are what you need.
1. Applicant's passport with blank pages and at least 6 months validity left before expiration.
2. A truly and completely filled visa application form affixed with one passport-size or 2x2 colored photo, with white background, full-face front view, and no hat. Photo must be glued on the application form. Stapled pictures will not be accepted. Scanned photos will also not be accepted. U.S. passport holders must submit two application forms with two photos.
3. A copy of the round-trip plane ticket
4. Hotel reservation / invitation letter with a copy of the inviter's valid chinese residence visa and passport information page of inviter's or Chinese national identity card.
5. Previously used China visa in old or new passport (Only visa stickers will be accepted. Those with stamped visas must submit additional documents for first time China visa applicants. Please refer to the list below.)

If there is China visa sticker on your passport, you don't need tp provide ITR, business registration documents, it is required for business applicants who apply for China visa for the first time.