Abstract: The interaction between a solitary wave and submerge breakwater, the section of which is rectangle or semicircular cylinder, is investigated based on lattice Boltzmann method. By establishing 2D numerical wave tank and making solitary wave by Rayleigh method, the process of interaction between solitary wave and submerge breakwater is studied. Numerical simulation of flow velocity fields and free surface show that this model can simulate the flow separation and vortex generation. Agreement is obtained by comparing the simulated and experimental results. The results reveal that the proposed model based on LBM can reproduce the nonlinear phenomena of wave transmission such as flow separation, vortex generation, wave breaking and propagating. The results can provide reference for submerge breakwater design in costal engineering.