中文摘要：

铁路线路和站点是城市政治、经济和地理等要素的综合反映，基于途经杭甬双城及长三角其他主要城市的铁路客运车次、类型和方向，刻画与检验杭甬双城及其与长三角城市群的关联特征，甄别城市联动动因。结果发现，空间距离和城市吸附能力是影响区域内城市间联动发展最重要的因素，人口规模和经济体量对上海与腹地城市之间联动关系的影响显著为负。杭甬双城呈现出典型的双核“互促”联动格局。上海和宁波与各自的腹地城市之间已经开启了“人口争夺战”，上海一支独大的中心地位正在被弱化。

英文摘要：

Railway lines and stations are the comprehensive reflections of urban political, economic and geo- graphical factors, this paper describes and examines correlation features between Hangzhou and Ningbo, and the other cities in Yangtze River Delta, and distinguishes the motivation of the linkage between cities based on the pas- senger train data, types and direction of the railway crossing Hangzhou and Ningbo, and the major tension. It was found that distance, adsorption capacity are the most important factors affecting the ment and linkage in the radiation area, influence of population size and economic volume are cities on the ex- cities＇ develop- signifi tive on the linkage between Shanghai and hinterland cities; as a twin city, Hangzhou - Ningbo shows a candy nega- typical dual core promoting mutually linkage pattern; Shanghai, Ningbo and their respective hinterland cities have shown a cer- tain trend to compete for the population, Shanghai＇ s dominant center position is weakening.