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<正>In order to promote the urban park development for emergency and disaster-prevention functions, the urban population spatial distribution is carried out with the guidance of the evaluation index system and the application of the GIS spatial interpolation methods,and the population service radiation capability of urban park green space is studied through the superposition analysis of the population density distribution and the park buffer zones.The results show that the total area of park buffer zone in Beijing city proper is 421.96km~2,38% of the total urban planning area,while the uncovered service space is 626.46km~2.In addtion, most of the park buffer zones in furthest periphery of the east,north and southwest parts of the planning area are less than 10 percent of their administrative area.Finally the layout of emergency and disaster-prevention functions of park green space are proposed on the basis of the analysis.