Professor Li Yupei, Department of Mathematics, Capital Normal University. 1990 was awarded the title of "Excellent Popular Science Writer since the founding of the People's Republic of China" by the Chinese Popular Science Writers Association. Starting from 1977, he has been engaged in the creation of popular mathematics. Over the past 30 years, more than 100 popular science works have been published, about100000 words. His works have won the 4th National Book Award, the 4th China Book Award, the 7th Five-Project Book Award, the first prize of the National Excellent Children's Book and the Soong Ching Ling Children's Literature Award.