At present, there are many universities in Peking University, but there are historical reasons. After the founding of the People's Republic of China, colleges and universities were reorganized, and a large number of teachers came from some liberal arts majors in Tsinghua, such as the College of Humanities (Department of Literature, Department of History, etc. ), physics department, mathematics department, moved to Peking University, a brother college, and a large number of library books followed.

I saw this information from the old library.