Sun (1911-1991) is a physical chemist and chemical educator. Mainly engaged in chemical kinetics research, he was one of the pioneers of early chemical kinetics research in China, and served as the head of the Department of Chemistry in Peking University for a long time. 1935 published the research results of "H2+H-→ H+H2 Reaction Potential Energy Surface" with Ailing et al., enjoying a high reputation.