The requirements for China work visa application are:
1. One completed Visa Application form:
2. Applicant's passport valid for at least 15 months with at least 2 blank visa pages.
3. One recent passport size photograph.
4. One Passport photocopy.
5. A notice of visa authorization from a duly authorized Chinese organization
6. Covering letter from applicant addressed to the visa office.
7. Alien Employment License
8. Physical Examination Record for Foreigner

Once you get a work visa to enter China, you have to apply for temporary residence permit within 30 days after entry.