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The transportation system of coastal cities is an important part of the social and economic system of coastal cities. The sustainability of its development is the premise to support the sustainable development of coastal cities. Sustainable development includes the planning, construction, operation, and management of transportation systems in coastal cities. In this paper, the data envelopment analysis (DEA) evaluation model and method of synergy and development efficiency of a coastal city traffic system was put forward from the angle of input and output in the traffic system and each subsystem, the index system of sustainable development of coastal urban traffic system, and then the DEA evaluation model of the coordinated development of the coastal city traffic system.