Abstract As an important tool for government to implement social integration, law is conducive to government realizing effective social integration of peasants (rural migrant workers) and the countryside. The transformation of contract environment from acquaintance society to stranger society demands objectively that the trust mechanism of rural migrant workers transform from special trust to general trust and favorable legal quality is conducive to rural migrant workers protecting their rights and interests and settling conflicts. As social integration model changes from “mechanical unconformity” to “organic integration”, responsive law is needed objectively to standardize and coordinate social division of labor and cooperation|the lawful regulation of rural migrant workers’ behavior is conducive to the realization of their citizenization and modernization. However whether from the aspect of the government and society or from the aspect of rural migrant workers themselves, there are some realistic problems with the legal realization of migrant workers’ social integration, so the legal realization of migrant workers’ social integration is limited