The frequency domain theory of the interaction of regular waves and the permeable seawall are analyzed. The forces of the permeable seawall and revetment are calculated and analyzed under different drafts,distances to the bank and porosity. Using the spectral analysis theory, we analyze the spectral characteristics of wave forces under different drafts and distances to the bank, and determine the cumulative frequency of the horizontal wave force of permeable seawall under irregular waves. It is known that wave forces of the permeable seawall are very sensitive to the porosity G and wave frequencies 棕.