Peking University and Tsinghua University are among the top higher education institutions in China. Their undergraduate enrollment is usually only for full-time undergraduate students. Although adult undergraduate courses were also a form of higher education, they did not accept adult undergraduate enrollment. It should be noted that some countries and regions may enroll adult higher education institutions, but in this case, Peking University, Tsinghua University, and other top universities in China would not directly participate in the enrollment.