The coordinated development between port logistics and the urban economy is an objective reality. The two rely on each other and support each other. This article takes Xiamen Port and Xiamen City as an example. By citing the synergy theory, a synergy evaluation model of the two is built, and a quantitative analysis of the synergy between the two is made. It is found that in the process of continuous improvement of the synergy between the two The improvement of logistics service capacity has a stimulating effect on the development of urban economy, and the development of urban economy also provides a strong resource support for port logistics, which can objectively improve the development level of port logistics. Therefore, the coordinated development between port logistics and urban economy deserves attention.