Abstract: In order to improve the wave dissipation performance of perforated breakwater and to reduce the stress of the structure, a new type of perforated composite plate type breakwater (Model c) is proposed. The structural features of the breakwater (Model c) are analyzed by comparison with the other two types of breakwaters (Models a and b). The physical model test is carried out to study the wave dissipation characteristics under different influence factors. The comparative analysis of transmission coefficients, reflection coefficients and energy dissipation coefficients of Model a and Model c is made, under different relative structure widths. And the wave absorbing effects of Models a and c are compared. The results indicate that Model c has the function of both the opening horizontal plate type breakwater and the perforated baffle type breakwater; the wave reflection of Model c, with a better wave dissipation effect, is smaller than that of Model a, and the structure of Model c can effectively reduce the force acting on the breakwater structure. When the width and the relative clearance ratio of the model are both large, the wave dissipation effect is better, and the wave dissipation performance of the breakwater in the unsubmerged state is better than that in the submerged state.