Hello, What are the requirements /required documents to get a work visa

To apply for work Z type, you should prepare those documents including your passport and copy of its data page, a completed application form, a recently-taken passport-style photo, and a work permit from your employer.
For your police check certificates and degrees, you should first get them notarized by the local notary public and the Ministry of Foreign Affairs of your country; and then go to the embassy of China to get that attested; the required documents include your passport and its copy, the application form for attestation, and your police check certificates and degrees and the copies.