中文摘要：

基于2015年长三角地区25个地级市之间的公路、普速列车、高速列车与信息网络数据,对流视角下该地区的网络结构特征及其效率进行综合分析与判断。研究表明：1流视角下长三角地区网络结构呈现出＂Z＂字型向＂一轴多极＂的网络空间结构转变、网络中核心与边缘城市节点价值的此消彼长和＂等级＋网络＂等新特征;2现代化的交通与通信技术变革加速了高端生产与管理要素在区域的集聚与扩散,促使长三角地区呈现出明显的＂核心—边缘＂格局;3长三角地区网络化的综合效率一般,仅有少部分城市达到了最优,但各城市的规模效率相对较好,是未来综合效率提高的主要影响因素。

英文摘要：

In the background of economic globalization and informatization, assessing spatial structures of mega- city regions has a long- term tradition in urban research. Network analysis,formulated by multi- disciplines ranging from sociology, information science and geography science, provides a new avenue to explore spatial structures at the regional scale. Based on the flow data of road, ordinary train, CRH（China Railway High-Speed） and Baidu index in 2015,this paper seeks to analyze and evaluate the features and efficiency of regional spatial structure among 25 cities in the Yangtze River Delta（YRD）. The results are as follows：（1） Different from some previous studies, the spatial structure of the YRD detected in this paper is manifested in several new characteristics, such as transferring＂Z＂shape to＂one axis and multicore＂, emerging a dynamic shifting node value between core and periphery cities and a tendency of ＂hierarchy ＋ network＂.（2） The innovation of modern transportation and communication technologies have accelerated both agglomeration and diffusion of the sophisticated production and management factors and also increasingly promoted each city node to connect with the cores and produced the main connections with non-adjacent nodes at the same time. Consequently, the network structure of the YRD shows an obvious＂coreperiphery＂pattern.（3） The network efficiency of the YRD is not high because only a small number of cities have had the most optimal efficiency. It is indicated that the YRD has great potential in improving its network efficiency. However, most city nodes perform well in terms of scale efficiency, which is the main reason for the increase in comprehensive efficiency in the future.（4） Most cities in the YRD fail to reach the optimal state in terms of network efficiency.The result implies that the development mode of relying on large-scale investment in exchange for the cities＇ high speed growth may come to the end. Therefore, for most cities in the YRD,pr