Introduction to Xu Guangqi: Xu Guangqi (April 24, 1562 - November 10, 1633), a Chinese mathematician, astronomer, agriculturist, irrigation expert, politician, military strategist and famous Catholic figure in the late Ming Dynasty. The Minister of Rites and the Bachelor of Wenyuan Pavilion. He devoted his life to the research of mathematics, astronomy, calendar, water conservancy and other aspects. He wrote diligently and was especially proficient in agriculture. He translated books such as "Elements of Geometry", "Taiwan Water Law" and "Agricultural Administration". At the same time, he is also a pioneer in communicating Chinese and Western cultures. He made important contributions to cultural exchanges between China and the West in the 17th century.