In ancient times 1 and Zu Chongzhi (Southern and Northern Dynasties) calculated pi to the seventh place after the decimal point for the first time, and their main works include Da Liming, An Bian Lun, Zhuan Shu, Yi Shuoji and Li Yi. 2. Liu Hui (Wei and Jin Dynasties): His representative works include Nine Chapters of Arithmetic Notes and Arithmetic on the Island. Modern times: 1, Hua: a gifted mathematician who was taught by himself and the founder of modern mathematics in China. 2. Chen Jingrun: His achievements in studying the number theory such as Goldbach conjecture are far ahead in the world, and he is called the first person of Goldbach conjecture.