From February 28, 2018 applications for extending Work Permit must be submitted 30days or longer before the expiration date, otherwise a new Wok Permit is needed to be obtained.
REMARK: as a result, applications for extending Work Permit are accepted 3 months before the expiration of the Work Permit till 30 days before the expiration of the Work Permit.
Related Laws
Exit and Entry Administration Law of the People’s Republic of China
Regulations of the People’s Republic of China on Administration of the Entry and Exit of Foreigners
Public Security Administration Punishments Law of the People's Republic of China