随着密云区承担北京市疏解整治任务的不断深入，人口集聚与产业发展对该区建设用地的需求刚性越来越大，应用ArcGIS软件，采用分步式计算方法测算了密云区各乡镇后备适宜性建设用地面积、开发利用潜力与空间分布特征，并以此为基础划定适宜性集中建设空间。结果表明：（1）密云区后备适宜建设用地总面积达到79.99 km2，占区总面积的3.59%，主要分布在区西南和东北部，其中西南部最为集中且相对连片，适宜大规模开发。（2）根据已有建设用地开发强度和后备适宜建设用地开发潜力，密云区各乡镇可分为高强度-高潜力区、高强度-低潜力区、低强度-高潜力区和低强度-低潜力区4类；高强度-高潜力区和低强度-高潜力区应作为未来城镇化、工业化进程的主要开发建设地区，尤其是高强度-高潜力区应进一步加强其核心及支撑作用，促进其他地区人口和产业向该区集聚从而达到消减建设用地、提升生态功能的目的；低强度-高潜力区是密云区发展的第二动力来源，其发展目标是地区的生态涵养与产业发展相协调。（3）以适宜建设用地空间格局及乡镇“强度-潜力”分类为基础划定集中建设空间，该类区域面积为482.19 km2，占全区总面积的21.66%，此范围将是密云区未来城镇发展的重要空间。

With undertaking the continuous deepening of Beijings decontamination task with extracting Beijings non-capital functions, population agglomeration and industrial development in Miyun district promote the demand growth of construction land.Taking the method of fractional step calculation, the quantity, grade division and spatial distribution characteristics of the reserved constructive land of Miyun district are assessed by using GIS spatial analysis techniques. The results show that: (1) the total reserved constructive land area is 79.99 km2, which accounting for 3.59% of total area. The reserved constructive lands mostly are distributed in southwestern and northeastern region of the district, and southwestern region is more concentrated and suitable for large-scale development. (2) Based on the development intensity of current construction land and exploring potential of reserved constructive land, the district can be divided into 4 categories,that is, high intensity-high potential (HI-HP) area, high intensity-low potential(HI-LP) area, low intensity-high potential (LI-HP) area and low intensity-low potential (LI-LP) area. HI-HP area and LI-HP area could be the main construction area in the process of urbanization and industrialization in the future. To achieve the goal of reducing construction land and enhancing ecological function in low potential area, the HI-HP area could play supportive roles in promoting the accumulation of population and industries. LI-HP area could be the second driving force of sustainable development of Miyun district, which should emphasize coordination between ecosystem stability and economic development. (3) Based on the spatial pattern of suitable construction land and the classification of “intensity-potential” of towns and villages, the centralized construction space is demarcated. The area within the space is 482.19 km2, accounting for 21.66% of the total district. This area will be an important space for the future urban development of Miyun district.