Compulsory education is a national education that all school-age children and adolescents must accept, and the state, society and families must guarantee it according to the Constitution. Its essence is a system of compulsory education for school-age children and adolescents for a certain period of time in accordance with the provisions of the law. Compulsory education is also called compulsory education and free compulsory education. Compulsory education has the basic characteristics of compulsory, public welfare and popularization. China's Compulsory Education Law stipulates that the length of compulsory education is nine years (six years in primary school and three years in junior high school), which conforms to China's basic national conditions and is appropriate.