中文摘要：

中国正步入高铁时代,时间距离逐渐取代传统的空间距离成为影响服务业布局的关键因素。长三角高速铁路大规模兴建和网络化布局,削弱了生产要素流动的空间壁垒,使得能在更广的范围进行资源要素优化配置。文章利用2006-2015年长三角城市群统计数据和列车实际运营数据,通过构建双重差分模型并引入经济地理学中引力模型量化了高铁引致的＂时空收敛＂效应,定量分析了长三角高速铁路由线成网推进对城市服务业集聚的影响。研究表明：（1）长三角高速铁路开通初期（2007年-2011年）对沿线城市服务业集聚的影响并不显著。从2012年开始,随着长三角高速铁路网络的日益完善,高速铁路对服务业集聚呈现出明显的促进作用,且这种促进作用有逐渐增强的趋势。（2）长三角高速铁路网建成后沿线城市市场区位均获得了提升,但提升幅度在时间和空间上存在明显的差异性。长三角高速铁路网引致的非均衡时空收敛效应使高铁沿线城市市场区位等级发生了重构,加剧了大城市和小城市区位条件的不均衡。（3）高速铁路引致的空间效应每提高1%,高铁沿线城市服务业就业密度约提高0.3%-0.4%。

英文摘要：

China is stepping into the high-speed railway（HSR）era.The time distance gradually replaces the traditional space distance,which has become the key factor affecting the layout of the service industry.The large-scale construction and network layout of the HSR in the Yangtze River Delta have weakened the space barrier to the flow of production factors,and have made the optimal allocation of resources in a wider range.Using statistical data and train operation data in the Yangtze River megapolis from 2006 to 2015,this paper quantifies the＂space-time convergence effect＂caused by HSR implementation by constructing the difference-in-difference model and introducing the gravity model in economic geography,and quantitatively analyzes the impact of HSR evolving from the line into the network on urban service industry agglomeration.It arrives at the results as follows：firstly,at the early operation of HSR（2007-2011）,the impact of HSR on urban service industry agglomeration in the Yangtze River megapolis is not significant;and since 2012,with the rapid development of the HSR network in the Yangtze River megapolis,HSR has played a significant role in promoting service industry agglomeration,and the intensity of the impact has gradually increased;secondly,after the implementation of the HSR network,the location of the urban market along the HSR line has been improved,however,there are obvious differences for the improvement in the time and space.The unbalanced time-space convergence effect caused by the HSR network in the Yangtze River megapolis results in the reconstruction of urban market location level along the HSR line,and has exacerbated the imbalance of the location conditions of big cities and small cities;thirdly,the spatial effect caused by HSR increases by 1% each year leads to the rise in the employment density of urban service industry along the HSR line by about 0.3%~0.4%.