1. Definition and regulations
a. Understanding the work permit
b. Understanding the labor contract
c. Understanding the Work Visa (Z)
d. Understanding the Resident Permit
e. Social security and taxes
2. Working status check-up guide
a. Checklist for the work permit
b. Checklist for the resident permit
3. Illegal situation guide
a. What could happen if you work illegally in China?
b. What to do if you discover you are working illegally?
c. What to do if you are caught working illegally?
d. Fines and consequences
4. Tianjin administrations address book (direct link)