The population development and change is affected by the birth rate，death rate and migration rate，Among them，the mobility rate has the greatest impact in Beijing. Based on the sample data of migrant collected by the National Health and Family Planning Commission，this paper analyzes the residence willingness of the migrant in the context of the dispersion of population and industry in Beijing. The migrant residence willingness is strong，and more than 90% of people will stay in Beijing in the future. Employment opportunities and education resources are the most important reasons for their stay in Beijing. The paper point out that the future population policy should be closely coordinated with the functional Orientation of the city of Beijing and guide the coordination of population flow with the urban development and population development. As for the migrants，the “problem solution” is as important as the “evacuation”. Finally some policy suggestions for future population regulation are put forward.