This paper studies the wave overtopping of reclamation engineering at the Yangtze River estuary with nonlinear shallow water equation SWASH model.In order to improve the dispersion of model,the vertical direction of model is divided into two layers,and the acceleration of vertical direction is considered.And then,the wave overtopping calculated by the sea embankment standard and SWASH model are compared to study the accuracy of the two ways.The results show that both the two ways can compute the wave overtopping exactly,and the result of model is more accurate.And,the impact of barrier board to wave overtoping should be considered in the numerical simulation.