"Z" Visa is for employment of more than 90 days to a maximum of 5 years.
You need a "Notification Letter of Foreigner's Work Permit" from PKU to apply for a Z visa if you will work at PKU for more than 90 days.
Documents Required:
? Application Form for Foreigner's Work Permit;
? Work contract;
? Physical examination certificate;
? Copy of your Passport (valid for at least 6 months);
? Work Experience Certificate (if necessary);
? Certificate of kinship for family members (if necessary);
? Certificate of Non-Criminal Records with its authentication and the Chinese version (if necessary);
? Diploma of the highest degree, its authentication and the Chinese version (if necessary).