With the increase of migrant workers in mega-cities,their willingness of becoming citizens is more and more urgent.In this paper,we get the gap between the real urbanization rate and the false urbanization rate of mega-cities,estimate the number of migrant workers and the scale of migrant workers who have urbanization willingness in mega-cities. We also analyze the particularity of migrant workers' citizenization in mega-cities,and summarize the successful local practice.Finally,we bring forward some suggestions about the citizenization of migrant workers in mega-cities. <<