Beach abrasion is when the beach loses more sediment than the incoming sediment caused by the onslaught of waves and the accompanying energy. Therefore, a structure is needed that can protect the coast. Breakwater is a common and widely used coastal structure as a protective structure, which serves to protect shorelines, coastal structures, harbors, and ships moored in harbors by reducing wave energyWave energy. A floating breakwater is one type of breakwater. This research studies the response amplitude operator on various porosityPorosity floating breakwaters simulated numerically on regular waves. The porous floating breakwater model that is observed is the pontoon without slope and with a porous slope with porosity of 0, 5, and 10%. The structure is modeled with regular waves, a wave height of 2 m, and wave periods with variations of 1.1–1.8 s. The results of the analysis show that the greater the porosityPorosity of the floating breakwater, the smaller the amplitude of the RAOResponse Amplitude Operator (RAO) motion that occurs.