legal ground
Article 10 of the Provisional Regulations on Residence Permit
The residence permit is issued by the public security organ of the people's government at the county level and endorsed 1 time every year. If the holder of the residence permit lives continuously in the place of residence, he shall go through the endorsement formalities at the local police station or the community service agency entrusted by the public security organ within 1 month before the date of residence. If the endorsement formalities are not completed within the time limit, the use function of residence permit will be suspended; If the endorsement formalities are completed, the use function of the residence permit will be restored, and the residence period of the residence permit holder will be continuously calculated from the date of the endorsement formalities.