China's Compulsory Education Law stipulates that the length of compulsory education is nine years, which conforms to China's national conditions and is appropriate. At present, the actual situation of compulsory education system in China mainly includes "six-three system" (that is, six-year primary school system and three-year secondary school system) and "May 4th system" (that is, five-year primary school system and four-year secondary school system). Among them, there are still a few areas that implement eight-year compulsory education, that is, five years in primary school and three years in secondary school, but these areas are also trying to realize the transition from eight-year system to nine-year system. Judging from the education system in China, nine-year or eight-year compulsory education includes two stages: primary school compulsory education and junior high school compulsory education. School-age children and adolescents who have completed nine or eight years of compulsory education in compulsory education schools according to regulations can reach the educational level of junior high school graduation.