Qin was a famous mathematician in Song Dynasty, and he wrote Nine Chapters of Shu Shu. Shu Shu has nine chapters with 8 1 questions, which are divided into 9 categories. This book is in the form of problem sets, without mathematical classification. Inscriptions not only talk about mathematics, but also involve natural phenomena and social life, which has become an important reference for understanding social politics and economic life at that time.

Shu Shu Jiu Zhang has many innovations in mathematical content, which is the inheritance and development of the nine chapters of arithmetic. It summarizes the main achievements of mathematics in Song and Yuan Dynasties and marks the peak of ancient mathematics in China.

The development and influence of Shu Shu's nine chapters.

Shu Shu Jiu Zhang is the inheritance and development of Jiu Zhang Arithmetic. It summarizes the main achievements of traditional mathematics in China in the Song and Yuan Dynasties and marks the peak of ancient mathematics in China. When it was a manuscript, it was successively included in Yongle Dadian and Sikuquanshu. 1842 was first printed and widely circulated among the people in China.

Qin's positive and negative cholesky decomposition and the great derivative method have long influenced the research direction of China's mathematics. The works of mathematicians, Li Rui, Zhang Dunren, Luo, Shi Yuechun and Huang Zongxian were all completed under the direct or indirect influence of the nine chapters.