To compare and analyze the wave-eliminating performance of the flat-arc-plate and the twin-flat-plate permeable breakwater structure under different incident wave conditions，we carry out an experimental study of the wave and its interaction based on the physical model test. The results show that the transmission coefficients of the flat-arc-plate and the twin-flat-plate transparent breakwater both fluctuate and decrease with the increase of the relative plate width，while the energy consumption coefficient is opposite. Under different diving depth conditions，the transmission coefficient and reflection coefficient of the flat-arc-plate transparent breakwater are both smaller than that of the twin-flat-plate transparent breakwater，and the transmission coefficient can be reduced by up to 22%. When the relative board width W/L=0.103，the maximum reduction in reflection coefficient is 82%. The energy consumption coefficient of flat-arc-plate permeable breakwater is greater than that of twin-flat-plate permeable breakwater. The relative W/L between the plates is in the range of 0.103 to 0.212，and the average increase in dissipation coefficient is about 22%. The research results r can provide necessary theoretical guidance for the application of the two permeable breakwater structures in engineering. It is recommended to choose the flat arc slab permeable dike in the actual project.