Regarding the sloping submerged dikes as an object of study, using physical model test method, we research the wave dissipation characteristics of submerged breakwater by selecting different relative inundated depths and rough permeability coefficients of surface protection structure type. Firstly, we analyze the changing rule of the transmission coefficient of the submerged breakwater due to various factors under regular wave, get the degree of influence of various factors on the submerged transmission coefficient, and obtain the variation law of the wave height along the ducts near the submerged breakwater. Secondly, using the same research methods of regular waves, we analyze the changing rule on the variation of transmission coefficient of the submerged breakwater under irregular waves, we get the degree of influence of various factors on the transmission coefficient of the submerged breakwater, and obtain the change of the wave along the way near the submerged breakwater.