Abstract:Based on the 2012 Floating Population Dynamic Monitoring Survey,this paper uses Brown decomposition method to analyze the income gap between rural-urban and urban-urban migrants.The result shows that income disparities between the different human capital is the major part of the overall income inequality.The household registration discrimination revealed in previous literature is caused by the different residences of household registration(local and non-local) instead of household registration nature (agricultural and non-agricultural household registration).Therefore,it is difficult to increase the income of rural-urban migrants and resettle them in the cities by only eliminating the differences between urban and rural household registration.