中国沿海城市在经济快速发展的背景下，面临资源利用与环境保护之间的矛盾。本文基于熵值法、三系统耦合协调度模型、核密度分析，对中国沿海53个地级市2003～2020年的经济—资源—环境（ERE）三系统耦合协调度进行定量分析。结果表明：在样本期内，中国53个沿海城市ERE系统耦合协调水平表现为低度、中度、高度三个阶段，总体呈现向高度转变的特征；沿海城市间耦合协调度差异明显，两极分化情况严重，深圳、东莞、珠海、广州等10个城市协调水平最高，其余城市协调水平较低；协调差异的限制性因素主要是经济系统，资源系统的影响处于中等水平，环境系统的影响最小。基于此，本文在城市协调发展、补齐经济短板、制定区域差异化政策方面提出对策建议。
China’s coastal cities are facing conflicts between resource utilization and environmental protection in the context of rapid economic development. This paper quantitatively analyzes the economy-resource-environment（ERE）three-system coupling coordination level of 53 coastal prefectural cities during the period of 2003-2020 based on the entropy method，three-system coupling coordination level model，and kernel density analysis. The results show that：during the sample period，the ERE coupling coordination level of the 53 coastal cities shows three stages of low，medium，and high coordination，and overall shows a shift to high coordination；the coordination degree between coastal cities varies significantly，with serious bifurcation，with ten cities such as Shenzhen，Dongguan，Zhuhai，Guangzhou，etc. having the highest level of coordination，while the rest have a lower level of coordination；the limiting factors for the coordination differentiation are mainly the economic subsystem，the influence of resource subsystem is at a medium level，and the influence of environmental subsystem is the least. Based on this，countermeasures are proposed in terms of coordinated urban development，making up for economic shortcomings，and formulating regional differentiation policies.
