Abstract: Ecological efficiency is an important index to measure the quality of marine fishery development.In this paper， the Three - stage DEA method was used to study the ecological efficiency of marine fishery in Qingdao，Yantai and Weihai from 2014 to 2018. The results showed that the ecological efficiency of marine fishery in coastal areas was generally improved year by year， but the ecological efficiency level of each city was different. At the same time，the number of marine pastures ( at or above the provincial level) and the number of inbound tourists as external variables had a significant impact on the ecological efficiency of marine fishery. Each coastal city should consider the external variables in combination with its own development characteristics to improve its life state efficiency.