A: Chen Heqin put forward the theory of life education, including teleology, curriculum theory, methodology and teaching principles. The purpose of life education is to be a man, not only from China, but also from modern China. In curriculum theory, nature and society are living teaching materials. Methodology: Learn by doing, learn by doing and make progress by doing. Teaching principles: seventeen principles are put forward, which can be summarized as the principle of activity, the principle of children's subjectivity, the principle of diversification of teaching methods, the principle of using live textbooks, the principle of active encouragement and the principle of teaching democracy.