The online inquiry system of national higher education diploma is a higher education diploma inquiry system developed by the National College Students' Information Consultation and Employment Guidance Center. It is the only higher education diploma information database in China, and provides query services for all sectors of society in various electronic registration databases of higher education diplomas. Entrusted by the Ministry of Education, it is responsible for the technical, transactional, online inquiry and certification services for electronic registration and filing of higher education qualifications, and is the only authoritative institution authorized to provide information consulting services for higher education qualifications in China.