For foreigners entering China with a visa, if the original reason for entry has not yet been terminated or if for other legitimate reasons that require you to stay beyond the expiration date specified in the visa without the need to change the type of visa, you may apply for extending the visa. Documents required for visa extension are as follows:

(I) Valid passports or other international travel documents;

(II) A completed Foreigner Visa Application Form, and a 33×48mm bareheaded color ID photo taken recently against a white background (free on-site photography is available);

(III) Supporting documents concerning the reason for the visa extension application;

(IV) Supporting documents concerning other relevant procedures.

For the application documents required for visa extension, processing procedures and methods, fee basis and standards, etc, you can visit the official website of China's National Immigration Administration and refer to the Guide on Visa Extension, Change and Reissuance for Foreigners under "Services", the requirements for the photos for travel documents can be found in the Guidelines for Travel Documents Photographs in the "Services" section. Additionally, you can find the office address and contact information of local exit-entry reception halls in "Office Enquiries" under "Services". You can also dial 12367 for further information.