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交通运输体系网络为找到较为精确地反映出城市间的连通程度、实际流量和功能联系的关键指标提供了可能。以城市间铁路客运车次数据为基础，构建城市体系空间联系指数甄别工具，可以有效描摹城市联动的内容，并能够识别空间格局体系结构和状态。京津冀地区铁路客运的城市吸附能力存在显著的地区差异：在规模上表现出明显的首位型分布特征，在空间上则呈现京、津、石为结点的“N”型分布特征。地理区位(外生)、吸附能力(内生)共同塑造了该地区的城市联动格局。天津和石家庄腹地范围的空间分异趋势明显，各城市对北京的依附强度并不依赖于地理距离而呈现梯度分布规律，即区域吸附中心地位早已巩固。政策启示：推动京津冀城市协同联动发展，各城市需要遵循“强强合作”之定力，协调政府与市场关系，破除行政分割顺势而为。高铁开通改变城市成长路径与城市联动格局，虽能够显著拉动地区投资，但长期来看却带有不确定性，腹地城市应该审慎对待高铁带来的经济和人口规模扩张的短期效应。","Based on the data of train numbers of intercity railway transport of passengers, the content of urban interaction can be depicted effectively, and the systematic structure and status of the spatial patte can be recognized, by constructing important screening tools for indicators of spatial linkage of urban system. In order to deeply reflect the possibility of urban interaction in the Beijing-Tianjin-Hebei region, this study”s estimation result indicates: There exist significant regional differences in urban absorption capacity of the passenger railway transport, manifesting obvious first-place distribution characteristics in terms of scale while rendering “N-type”distribution characteristics with Beijing and Tianjin and Shijiazhuang as major nodes in spatial terms. The geographical location ( exogenesis) and absorption capacity ( endogenesis) jointly shape the urban interaction patte of this region. The empirical result evinces: The spatial variation of the range of central cities” hinterland takes on a distinct tendency. The intensity of attachment of all cities to Beijing is independent of their spatial location and geographical position while rendering a regularity of graded distribution. Policy inspires: all cities need to comply with the possible anchoring force of “strong-strong cooperation” to advance Beijing-Tianjin-Hebei synergic interactive development, namely hinterland cities with stronger urban absorption capacity shall bear closer interactive relationship to the central city. The operation of high-speed railway changes urban growth path and urban interaction patte and can significantly drive regional investment. But there is uncertainty in the long run. Hinterland cities should prudently treat the short-term effects of economy and population size dilation brought along with high-speed railway.