Sampling of undergraduate thesis. The Ministry of Education will spot-check graduates' papers, and spot-check may find everyone. If the spot check fails, it will be more troublesome. Students need to revise their papers, spend a lot of time and energy, and then take part in the defense again, and their degree certificates will be taken back. Without their undergraduate degrees, they will face unemployment or expulsion from graduate schools, and their tutors will also face punishment. Undergraduate thesis sampling is conducted once a year. The sampling object is the thesis that awarded the bachelor's degree in the last academic year. In principle, the sampling ratio is not less than 2%. Unqualified graduation thesis will be identified as "problematic graduation thesis". The purpose is to strengthen and improve education supervision, evaluation and monitoring, do a good job in sampling the design of undergraduate graduation thesis, and ensure the basic quality of undergraduate talent training.