I want to get 'Z' Visa (Residential). what documents are required?

The Z visa requirements include: applicant's passport; one recent passport photo; visa application forms V2011A and V2011B; your local police character/clearance certificate; invitation letter from duly authorized China unit or confirmatation letter of invitation; registration Certificate of Foreign Enterprises Permanent Office in China/Alien Employment License of the P. R. China/Working Permit by the State Administration of Foreign Experts Affairs, China; Physical Examination Record for Foreigner and attested by Ministry of Foreign Affairs of Pakistan; Employment Contract; Your Employer's Company Registration Certificate in China (copy) .