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. The period of compulsory education stipulated in China's Compulsory Education Law is nine years (six years in primary school, three years in junior high school, five years in primary school and four years in junior high school in some provinces and cities), which is in line with China's basic national conditions and is appropriate.