Abstract: China has 3 million square kilometers of sea area under its jurisdiction. Among the three modern cutting-edge scientific and technological revolutions, marine technology has extremely important practical signifi cance. With the development and construction of large-scale marine projects such as marine development and coastal nuclear power. The durability of marine concrete and the optimization of mixing ratio design have become the focus of academic research. However, the construction of contemporary marine engineering is also inseparable from cement concrete materials, so it is urgent to study marine concrete with high durability and reasonable mixing ratio. In marine environment, the pier of the bridge directly aff ects the structural safety of the whole bridge.Therefore, the author chooses pier shaft as the research object, optimizes the design of marine concrete by comparing data such as range analysis, and studies its durability. At the end of the article, the author puts forward protective measures against the erosion of marine concrete.