The functional concentration of population as well as political, economic and social activities to the Capital region has brought about various problems and inefficiency to the whole society and further aroused heated controversy over the causes of the concentration. This study paid a special attention to the proposition that the land development in the Capital region is likely to attract people’s in-migration and results in over-concentration and tried to figure out its truth or falsehood. Through the thorough examination of the actural filtering process in the region for more scientific and reliable research outcomes, this study found out that the in-migration effect of new land developments in the Capital region turns out to be far less than generally known. Based on the research outcomes, we propose a search for both new housing policy in the context of metropolitan growth management and the policy that can contribute to the mutual development of both the Capital and other local regions.