Abstract: 【Objective/Meaning】By taking Dongshan County in Fujian Province as an example, the coordination of marine ecological protection and marine economic development was explored from both theoretical and empirical aspects, and the role of the viewpoint of adhering to the balance of land and sea and firmly promoting the construction of a powerful ocean in the process of driving China's economic development which was put forward by the 19 th National Congress of the Communist Party of China was explored, in order to put forward referential suggestions for promoting the coordinated development between marine economy and ecological protection.【Methods/Procedures】By constructing the coupling coordination model of marine ecological protection and marine economy, the coupling coordination degree between ecological protection and marine economic development in Dongshan County was measured by using the entropy method, and the change trend of coordination degree between marine ecological protection and marine economic development in Dongshan County from 2015 to 2018 was obtained. 【Results/Conclusions】The results showed that the coupling coordination of Dongshan County was generally declining, the level of ecological environment development was declining, and no long-term operation mechanism has been established. There were still some problems such as insufficient ecological environment protection, the decreasing quality of marine environment, the need to improve the level of marine science and technology, and the unreasonable structure of marine industry, etc. In view of these problems, some countermeasures were put forward, including cultivating the awareness of marine ecological civilization, establishing the compensation mechanism of marine ecology, increasing the investment in scientific and technological innovation, and optimizing the industrial structure of marine economy.