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随着城市规模的不断扩大，地铁的出现在一定程度上缓解了城市交通拥堵问题. 国内多个城市都已经开通或新规划了多条地铁线路. 如何评价地铁对于城市公交网可达性的改善作用，从而为地铁站点规划和线路分布的决策提供理论支持，是迫切需要关注的问题. 本文采用复杂网络分析法，把公交站点作为节点，站点间的连线作为边，建立了包含地铁线的南京市公交网的拓扑模型. 以站点间的最少站点数和最少转车次数作为衡量交通可达性的指标，分析了Space L和Space P模型中地铁对于城市公交网可达性的影响. 结果表明，地铁的开通提高了城市公交网的整体可达性. 南京地铁沿线站点到其他站点的可达性、地铁沿线站点到商业中心的可达性的提高更为明显.

Research on Accessibility Improvement of Urban Public Transport Network Based on Metro

With the continuous expansion of urban scale, the appearance of metro alleviates the problems of urban traffic congestion to some extent. Numbers of cities in China have been launched or are planning a number of new subway lines. How to assess the role of accessibility improvement about the subway for urban public transport, so as to provide theoretical support for making decisions in programming sites and distributing lines, is an urgent need for concern. Combining with the method of complex network, looking the bus stations as nodes and the connections between the sites as edges, the topology model of public transport network including metro lines in Nanjing is established. With the minimum number of sites between sites and the minimal transfer times as the measure indicators of transport accessibility, the accessibility effects of metro for urban public transportation network about Space L and Space P model are analyzed. The results show that the opening of the metro improves the overall accessibility of urban public transport network. The accessibility improvement of metro sites to other sites and commercial centers is more obvious.