Reclamation engineering has a certain impact on the surrounding sea beach trough shape and the ecological environment while promoting regional economic development.Taking the start scheme of Tongzhou Bay harbor as an example,the tidal current model is established to simulate the tidal current pattern of the radiated sand ridge group in the South Yellow Sea.On this basis,two different reclamation schemes are compared to the sedimentary erosion and deposition of floodplains in the project area.On the whole,the two schemes have obvious effect on the sedimentary erosion and deposition of the sea area around the project,but they tend to balance as time goes on.Based on the current simulation results,the second pool of the early implementation which is off the shore is more conducive to maintaining the flow of Xiaomiaohong channel and tidal resources protection.