Qin was a famous mathematician in the Southern Song Dynasty. He paid equal attention to theory and practice, was good at inheritance and innovation, cared about the national economy and people's livelihood, observed the sufferings of the people, advocated benevolent government, and supported and participated in the war against gold and Mongolia. His method of seeking greatness and broadening, positive and negative cholesky decomposition and his masterpiece "Several Books and Nine Chapters" are a dazzling page in the history of Chinese mathematics and even the history of the world mathematics, which has had a wide impact on the development of mathematics in later generations. Qin independently introduced the triclinic quadrature formula, which filled a blank in China's traditional mathematics, from which we can see the high level of China's ancient mathematics. Lu Xinyuan (1834- 1894), a famous mathematician in Qing dynasty, praised: "Qin Jiushao can be said to be a hero who never talks about algorithms." Cantor (1829- 1920), a famous German mathematician, spoke highly of the technique of finding the solution of large extension. He praised the China mathematician who discovered this algorithm as "the luckiest genius". Sutton (1884- 1956), a famous American historian of science, said that Qin was "one of the greatest mathematicians of his country, his era and, in fact, that era".