2. The Book of Rites is an important collection of laws and regulations in ancient China, with 20 volumes and 49 articles. This book mainly describes the pre-Qin ritual system, which embodies the pre-Qin Confucian philosophy, education, politics and aesthetics. It is an important material for studying the pre-Qin society and a compilation of Confucianism. "University" is an essay on Confucian thoughts of self-cultivation, governing the country and leveling the world. Originally, it was the 42nd article of The Book of Rites Dai Xiao, which was said to have been written by Ceng Zi. In fact, it is a Confucian work in the Qin and Han Dynasties, and it is an important work for China to discuss educational theory in ancient times. After being highly praised by Cheng Hao and Cheng Yi in the Northern Song Dynasty, Zhu in the Southern Song Dynasty wrote "University Chapters and Sentences", which was finally called "Four Books" together with The Doctrine of the Mean, The Analects of Confucius and Mencius. After the Song and Yuan Dynasties, "Da Xue" became the official textbook of the school and the required reading of the imperial examination, which had a great influence on the ancient education in China.