The "six-year system" in primary schools was implemented in April 1986. 1986 In April, China promulgated the Compulsory Education Law of People's Republic of China (PRC). This is the first time that China has fixed free compulsory education in the form of law, which means that school-age "children and adolescents" must receive nine-year compulsory education.

The promulgation of Compulsory Education Law marks that the development of basic education in China has entered a new stage. Although there is only 18, "the state implements nine-year compulsory education" has since become a legal obligation. The Compulsory Education Law of People's Republic of China (PRC) was revised and adopted by the 22nd meeting of the 10th NPC Standing Committee in People's Republic of China (PRC) on June 29th, 2006, and came into force on September 1 2006.