Abstract: When the distribution of mobile population is non-uniform in space, such as mobile overpopulation in local area which will cause the imbalance with local population result in and islanding phenomenon, or slum tendency similar to foreign countries, it will bring great difficulty and risk to service and management. An analytical method was established for the space distributional characteristics of mobile population based on the fractal principle. Through studying the space distributional characteristics of mobile population in Haidian District, the results show that the mobile population is relatively stable in space distribution, the aggregation degree is not obviously deteriorated, and the management risk changes little.