With the proceeding of urbanization,it is imperative to tear down the urban-rural dual structure for the integration of urban and rural economic and social development.The nation has introduced the policy of reforming the household registration system to deal with this problem.By means of empirical investigation,it is found that migrant workers show different attitude to the policy.According to the internal polarization of migrant workers,this paper applies the rational choice theory and starts from different levels of rational dimension to analyze the factors that affect different types of mi...