目的：城市轨道交通快速发展,地铁作为重要公共交通,提供了高效的大规模出行选择。已有研究普遍认为,地铁站点周边建成环境影响客流量，但PCA（Pedestrian Catchment Area）大小尚未统一。本研究旨在验证PCA大小是否影响地铁客流与建成环境相关性研究的结果值。方法：以南宁地铁1号线25个站点为例，选取居住人口、工作岗位、商业设施等5个指标作为自变量，站点实际乘客量作因变量。采用OLS回归模型，对比不同PCA半径变量下模型拟合和影响因素分析结果。结果：地铁站点PCA不同集水区范围内的数据收集，对客流量与建成环境关系研究结果存在差异。针对南宁市，其PCA的半径取值为600m，在地铁客流与建成环境相关性模型的拟合较好于300m和900m。结论：PCA范围会导致地铁客流与建成环境关联研究结果不一致。未来相关研究需针对不同PCA半径进行模型分析，根据拟合效果确定适宜PCA尺度，提高研究准确性。

Objective: With the rapid development of urban rail transit, the subway, as an important public transportation, provides an efficient large-scale travel option. Previous studies generally believe that the built environment around subway stations affects the passenger flow, but the size of PCA (Pedestrian Catchment Area) has not yet been unified. The purpose of this study was to verify whether the size of PCA affects the outcome value of the correlation study between metro ridership and the built environment. Methods: Taking 25 stations of Nanning Metro Line 1 as an example, five indicators were selected as independent variables, including residential population, jobs and commercial facilities, and the actual passenger volume of the stations was used as the dependent variables. The OLS regression model was used to compare the results of model fitting and influencing factor analysis under different PCA radius variables. Results: There were differences in the research results of the relationship between passenger flow and built environment in the data collection of PCA in subway stations within different catchment areas. For Nanning, the radius of the PCA is 600m, and the fitting of the correlation model between subway passenger flow and built environment is better than that of 300m and 900m. Conclusion: The scope of PCA will lead to inconsistency in the results of the study on the association between subway passenger flow and the built environment. In the future, it is necessary to conduct model analysis for different PCA radii and determine the appropriate PCA scale according to the fitting effect to improve the accuracy of the research.

国家自然科学基金资助项目（项目批准号： 52102386）；国家青年科学基金项目（项目批准号：51908028）