Wave overtopping on the breakwaters is an important issue in breakwaters’ design. Most of the previous studies focused on experimental researches and numerical modeling of irregular wave overtopping particularly on porous breakwaters has not been studied. In the present study, the verification between experimental studies and numerical modeling of irregular waves overtopping on the porous breakwater has shown 15% error for the wave height of 3 meters. Due to the existence error in accuracy of numerical model and software and the difference between numerical and experimental model, this error is in the acceptable range and usual in numerical studies. Moreover, this study presented the comparison between Owen formula and numerical modeling results of wave overtopping for two different conditions: the breakwater with the porosity of 0.15 and non-porous breakwater.