Left-behind children refer to school-age children and adolescents who have worked outside for more than three months and stayed in their hometown where their household registration is located, and are cared for by their parents or other relatives to receive compulsory education. The group of returning children refers to the special group of migrant children who have returned to their domicile from their original school for some reason. The problem faced by left-behind children is that their parents are not around. The main reason why parents are not around is that the local industry can't give their parents working resources, that is, the local economy has developed and there are enough jobs to solve this problem. The same is true for returned children. As long as parents go out to work, there will be no group of returning children.

First, getting rid of poverty and getting rich can solve the problems of left-behind children and returning children. Most people go out to work because their hometown is poor and there is not enough source of income. Now China has begun to get rid of poverty and become rich. Every poor place has begun to get rid of poverty, and industrial poverty alleviation will create jobs. Then people who work outside the home will go back to their hometown if they have jobs in their hometown, so that they can live with their children, and children who work with their parents don't have to study outside.

Second, increasing jobs can solve the problem of left-behind children and increase local jobs. Local people will not go out to work if they have a job and a source of income. No one wants to leave their hometown to work outside. The reason why they go out to work is just to make a living. When their hometown has a source of livelihood, they will keep this group of working people.

Third, adjusting the enrollment standards can solve the problem of children's return. Compulsory education is based on household registration, so many students who follow their parents out of town have to go back to their household registration to study. The root cause here is that there are not enough local degrees for parents to work. If the number of places is increased to the same as that of primary and secondary schools, then nine-year compulsory education will not produce returning children.