It is a book about mathematics written by Zhu Shijie, a mathematician and educator in Yuan Dynasty. The encounter with Siyuan is regarded as another symbol of the peak of mathematics in China in Song and Yuan Dynasties, and an important milestone in the development of ancient mathematics in China.

"Meeting with Siyuan" mainly tells some mathematical problems such as "thinking skills", "superposition skills" and "calling skills". "Quaternary technology" is about the solution of multivariate higher-order equations. The column method and solution of binary, ternary and quaternary higher-order equations are given in the book. "Superposition technique" is a method to solve the high-order arithmetic progression summation problem, and "Call difference technique" is about finite difference.

Zhu Shijie introduced.

Zhu Shijie is not only a mathematician, but also an educator. His representative works are "Meet with Siyuan" and "Enlightenment of Mathematics". He, together with Qin, Yang Hui, was called the four great mathematicians in the heyday of China.

He, Qin, Yang Hui are four monuments in the field of ancient algebra in China. People prefer to use the title of "Four Masters in Mathematics" to commend their outstanding contributions in the field of mathematics. Many ancient science, culture and technology are closely related to their mathematical works.