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Spatial enlarging is the result of urban development. Owing to different motivations, migration trends during urban spatial enlarging between developed and developing countries are quiet different. The authors of this paper will take a sample of the working population in Beijing and use a survey, Geographical Information System (GIS) and statistic methods to analyze spatial disparity, in order to display the approach of urban spatial enlarging. The survey demonstrates that the downtown area is still a combination of living and working places. The conclusion is that the motivation for migration comes from the force of construction in urban areas rather than from good dwelling environments in suburbs. This is the main reason of urban problems during spatial enlarging.