Book of Rites: "The Yin people set up the right school as a university and the left school as a primary school, and they were happy to teach Buddhism." "Book of Rites": "The Yin people raised the country over the right school and raised Shu Ren over the left school." Zheng Xuan's Note: "I went to Shandong, went to school on the right, went to college, and was also in the western suburbs. Xiayi, Zuoxue and Primary School are also in the east of Zhonggong. " These materials show that "primary schools" have been established in school education in Shang Dynasty.