In view of the variety of wave form,we conduct two-dimension physical model experiments to study regular wave propagation over trapezoid submerged breakwater.We consider the effect of different wave elements (wave height,period and water depth)respectively to analysis the transformation of regular waves,and use wave height ratio as a relative parameter.The experiment results show that,the higher incident wave height,the smaller wave period and the smaller water depth leads to more obvious wave height attenuation with other conditions unchanged.Waves with enough water depth and smaller wave height propagate through submerged breakwater well;as wave height increasing,wave breaking happens on the top of submerged breakwater,and then wave height ratio decreases after it;for wave un-breaking and longer wave period cases,wave height ratio increases with two peak values on the top of structure.