中文摘要：

选取长江三角洲城市间每日公路长途客运班次和高速铁路每日经停班次作为城市间客运交通流的替代数据。从联系强度和节点关系两个方面对长三角城市区域功能多中心结构的特征及演化趋势进行解析。认为在长三角城市区域层面．南北两翼的城市间联系网络相对独立．两翼城市与上海的联系以及两翼内部城市间的联系均呈现出北强南弱的现象，这一现象与南、北两翼产业发展的总体特征和升级路径具有较强的相关性。上海作为长三角的核心枢纽．南京、杭州、宁波作为长三角次级枢纽的格局较为清晰。苏州、南通和无锡作为上海大都市区的直接腹地甚至通勤区的态势进一步显现。随着高速铁路的发展完善．长三角城市区域“等级＋网络”的演化趋势日益明显。一方面上海的极化趋势进一步增强，与此同时整个区域产业发展与基础设施的发展将呈现出进一步均衡的态势。

英文摘要：

Using flows of intercity buses and intercity CRHs （China Railway High-speed） in the Yangtze River Delta as proxies for the intercity passenger traffic flows, this paper analyzes the characters and trends of the polycentric structure of Yangtze River Delta from the perspective of relation intensity and organizational structure of urban node. It is found that the intercity relation network of the North and the South Wing in Yangtze River Delta is relatively independent, and the relations between the North Wing cities and Shanghai is more intensive than those between the South Wing cities and Shanghai. Furthermore, the relations among the North Wing cities are also more intensive than those among the South Wing cities. With regard to the city-region＇s spatial structure, Shanghai is the primary hub-city; Nanjing, Hangzhou and Ningbo are the secondary hub-cities; and Suzhou, Nantong and Wuxi are possibly the direct hinterland cities or even become included in the commuter zone of Shanghai metropolitan area. It is concluded that the ＂network ＋ hierarchy＂ pattern is emerging in the Yangtze River Delta. This means that on the one hand, the polarization of Shanghai is strengthening, and on the other hand, the development of industries and infrastructure is going to be envened out in the whole city-region.