A horizontal 2D numerical model of wave based on the Boussinesq equation is used to study the simulation of wave transformation in the harbor area protected by submerged breakwaters,which the submerged breakwaters are handled as the moving boundaries.The numerical model is first tested to prove its applicability in the simulation of wave transformation over submerged breakwater by the experimental data proposed by Ohyama,et al.Then,the numerical model is used in the water area outside a fishing port which is protected by a submerged breakwater.The processes of wave dissipation are analyzed,and the wave transmission coefficients obtained by simulation are compared with the calculated values of the empirical formulas at home and abroad.The results show that the present simulation method can effectively simulate the wave transformation over the submerged breakwater.