为了应对百年未有之大变局、实现中华民族伟大复兴目标，长三角区域一体化发展已上升为国家战略。长三角城市一体化水平如何，面临哪些障碍，应该采取哪些措施来推进一体化发展，都是需要回答的问题。为此，在明确区域协同发展理论的基础上，通过构建包含经济、科技、设施、生态四大领域18个指标的长三角城市协同发展能力评价指标体系，对2020年41个地级及以上城市协同发展能力进行测算，发现长三角地区基于“Z”字形发展轴的“核心—边缘”空间结构特征显著，区域一体化程度较高，各领域对城市协同发展能力贡献以及相互关系不完全相同。为此，长三角三省一市应更深入推进长三角区域一体化，改革长三角公共管理体制机制，创新环保跨界联动机制，重视新基建、城市群、产业体系三者之间联动，设立长三角产业创新基金会，重点建设集成电路和生物医药世界级产业集群等。

In order to deal with the new situation and achieve the goal of great rejuvenation of China, the regional integration development of the Yangtze River Delta has become a national strategy. What is the level of urban integration in the Yangtze River Delta, what obstacles it faces, and what measures shall be taken to promote integrated development – all of these are questions that need to be answered. Based on the systematic review of relevant theories, this paper constructs an evaluation index system of urban coordinated development capacity in the Yangtze River Delta, which includes 18 indexes in the four fields of economy, science and technology, facilities and ecology. Through the calculation of the collaborative development capacity of 41 cities in 2020, it shows that the “core- edge” spatial structure based on the “Z” shaped development axis in the Yangtze River Delta is significant, the degree of spatial integration is high, and the contribution and relationship of various fields to the urban collaborative development capacity are not exactly same. According to the current situation of the pattern of coordinated development of cities in the Yangtze River Delta, this paper puts forward some policy suggestions, such as reforming the public management system and mechanism in the Yangtze River Delta, innovating the cross-border linkage mechanism of environmental protection, paying attention to the linkage between new infrastructure, urban agglomeration and industrial system, establishing the Yangtze River Delta industrial innovation foundation, focusing on the construction of world-class industrial clusters of integrated circuits and biomedicine.