Significant effect of refraction and similar total internal reflection occurs on harbor dredging border when the angle of incidence of wave is large,which may affect navigation channel,breakwater and different position in harbor area.We use the Boussinesq equation to establish a typical numerical model of the process,and nondimensionalize the relevant controlling parameters.The simulation obtains the wave distribution under different conditions,and derives the regular pattern of the effects of different parameters.The results show that among various influencing parameters,the ratio of incident wave height and water depth,the bottom slope and the angle of incidence have the relatively significant impact on the maximum wave height and distribution of wave energy accumulation.