There are many reasons. Nankai is small in scale, and its teachers are naturally inferior to Tsinghua Peking University. The number of papers published is naturally not as large as that of large-scale schools. The number of papers is also considered in the ranking, because the top ten schools are large in scale and the state has invested a lot of money. Most schools are jointly built by the Ministry of Education and local governments, and the attitude of local governments has also affected the development of schools. The Tianjin municipal government has always said that it will invest in the construction and development of Nankai, but it has rarely fulfilled it. Nankai is not as big as the sky. Tianda is a strong engineering school, and its purse is stronger than Nankai Drum and Nankai Arts and Sciences. It is an indisputable fact that teachers are not well paid, because they owe so much money. Nankai is one of the few universities that does not advocate merger. The scale of Nankai is very stable, and many majors are still very strong. The current university ranking institutions can get a good ranking as long as they give money, and Nankai never gives money.