After the visa expires, the applicant should re-apply. The Chinese embassy or consulate abroad will not handle the visa extension procedure. When applying for a visa, the party concerned should indicate the time of stay in China on the visa application form. After entering the country, if you cannot leave the country according to the original plan for some reason, you should go to the local public security exit and entry administration department to go through the visa extension procedures before the expiration of the stay period. For specific requirements, please consult the public security department.