This paper focuses on the four subsystems: economy,resource,environment and society,which are closely related to the development of the coastal cities,and constructs the evaluation index system of green transformation ability of coastal cities for the first time. The entropy weight method is used to determine the weight of each index. The relevant data of Dalian city from 2005 to 2014 are used for empirical research. The results show that the capacity of green transformation in Dalian has been gradually enh...