城市商圈是城市商业活动的区域中心，以兴趣点（POI）为研究对象，提出一种识别商圈及辐射范围的方法。首先以相同分店名称的POI构造多边形，利用拓扑运算实现对相交和包含多边形的处理，将其作为商圈核心范围，然后利用空间聚类思想计算商圈外围POI的隶属度，进而利用空间插值方法对隶属度进行插值拟合，实现商圈辐射区域的生成，最后以北京市为例进行了商圈的提取和分析，取得了较好的效果。主要结论为：该方法可以有效提取城市商圈的核心范围及辐射范围，对研究城市功能区具有重要价值。

Urban business district is the regional center of urban commercial activities. Taking POI as the research object,we proposed a method to identify the business district and the radiation range. Firstly, we constructed the polygon with the POI with the same branch name, and realized the processing of the intersection and inclusion polygon by topological operation, which wastaken as the core scope of the business district.Then,we used the spatial clustering idea to calculate the membership degree of peripheral POI of business district, and further used the spatial interpolation method to interpolate the membership degree togeneratethe radiation area of business district. Finally, taking Beijing for example, weextracted and analyzed the business district, with good results achieved. The method can effectively extract the core scope and radiation range of urban business districts, which is of great value for the researchof urban functional areas.