Abstract: On the basis of field data about wind， tidal current， wave and sediment， the natural conditions including meteorological， hydrological， and geomorphological conditions of the coastal area near the Yangkou port in the radial sand ridges are analyzed. A 2-D wave-tidal current-sediment mathematical model is established and used to simulate the changes in tidal current and sediment after the waterway excavation and to predict the annual siltation volume and the silting-up distribution under the strong-wind weather conditions. The analysis results show that the influence of the waterway excavation on tidal current field is not significant， except a slight variation of the current speed along the dredged section. The annual siltation volume is less than 7 million m3， and the sudden siltation will not happen under the strong-wind weather conditions. Therefore， the feasibility of the waterway excavation in the northern Lanshayang tidal channel preliminarily proved would be available.