According to media reports, the Ministry of Education recently released the "reply to recommendation No. 8368 of the fourth session of the 13th National People's Congress" and replied to the "proposal on allowing migrant workers' children to enjoy nine-year compulsory education fairly". The Ministry of Education said in its reply that from 2021, parents in various places should not ask parents to provide proof materials for family planning, over age admission, unregistered residence, etc., and simplify unnecessary proofs, and encourage conditional places to enter schools only with residence permits. Nine year compulsory education is a constitutional right, and its establishment, acquisition and enjoyment are unconditional. Nine year compulsory education is not only a national right, but also a national (government) obligation. Similarly, the fulfilment of such obligations is unconditional. From the process of the formulation and amendment of the constitution, since the establishment of this right, except for the length of compulsory education, other contents of the right have not changed. However, great changes have taken place in China's economy and society in the past 40 years, which has changed the background of the establishment of this right and the basis for the enjoyment of rights and the performance of obligations to a considerable extent. In the past, under the social and economic division of labor, the allocation of labor force was carried out according to the plan, so the independent migration of labor force and the free flow of personnel were less. Under such conditions, the cost of implementing the right to compulsory education is shared by the whole economy and society. With the development of socialist market economy, the market plays a more and more decisive role in resource allocation. Today's labor flow and personnel migration are carried out in the direction of market signals. Of course, the allocation of labor force is not only the role of the market, but also its mobility needs the collaborative innovation of relevant social systems and mechanisms. In this sense, in addition to the constitutional rights, the enrollment of accompanying children increases the rigid constraints from the economic perspective. With the rapid economic growth, the concentration of resources is bound to rise, which also brings a large number of labor mobility. In this process, the flow of labor factors is not limited to individual labor force, but more in the unit of family. This undoubtedly provides a new background for the implementation of compulsory education. Timely response to such changes is the basis for ensuring that citizens enjoy constitutional rights equally. (outlook new era)