As one of the four ancient civilizations, China has made many outstanding achievements in the long history of mathematical development. Like the discovery and proof of Pythagorean theorem? The invention and use of "0" and negative numbers? Decimal notation? Zu Chongzhi's calculation of pi? The quaternion of the equation is a contribution to the field of ancient mathematics in China and occupies an important position in the history of mathematics in the world. China's brilliant achievements in ancient mathematics are an important step in the process of human understanding of mathematics, far ahead of the world, expanding the field of mathematics, promoting the development of mathematics and playing an important role in the process of human understanding and transforming the world.