He went to Germany and France for many times to study philosophy, literature, aesthetics, psychology and cultural history, which laid the ideological and theoretical foundation for his reform of feudal education. Former Chief Education Officer, President Peking University, President of Renmin University and President of Academia Sinica. He has made great contributions to the development of new culture education in China and the establishment of bourgeois democracy in China, and can be called "an academic master and a world model". He put forward the educational policy of "five educations" (military national education, materialism education, civic moral education, world outlook education and aesthetic education) and the educational proposition of "respecting nature" and "developing personality" for children. He tried to replace family education with preschool children's public education gradually through the experiment and promotion of poor children's homes, and finally realized preschool children's public education ideal. He is an advocate of modern aesthetic education in China. He advocates aesthetic education from three aspects: family education, school education and social education. He envisions aesthetic education for preschool children through three institutions: prenatal education as the starting point of aesthetic education; Let babies and their mothers live in an environment composed of natural beauty and artistic beauty; On the one hand, the aesthetic education in kindergartens is carried out through "aesthetic education topics" such as dancing, singing and handicrafts; On the other hand, we should make full use of aesthetic factors in other courses, such as "calculation and speech, and cater to their aesthetic feeling in arrangement and tone, and we should not be bored with algorithms and grammar." Educational works include Selected Works of Cai Yuanpei's Education and Selected Works of Cai Yuanpei's Education.