Li is a famous mathematician in China and one of the founders of modern mathematics education in China. He went to the United States to study in the 1920s, and studied at Harvard University and Princeton University successively. After returning home, he brought his advanced mathematics knowledge back to China and began to teach advanced mathematics courses in Peking University. Li popularized advanced mathematics in China and made great contributions to the development of mathematics education in China. His teaching methods and textbooks are widely used, which has had an important impact on cultivating outstanding mathematics talents from generation to generation.