Abrasion is known to be a phenomenon that is included in coastal disasters because it can result in erosion or narrowing of the coastline. One effort to overcome this problem is to build a coastal protection structure, such as a breakwater. However, problems reappeared regarding construction costs in deep waters, so another alternative was used, namely floating breakwaters. This study uses a floating breakwater with two porous slopes to determine wave reflectionReflectioncoefficients with computational fluid dynamicsComputational Fluid Dynamics (CFD). The numerical results show that the model with a double-slope without pores has the highest reflectionReflection coefficient with an average of 0.93, while the model without a slope (pontoon) has the lowest reflectionReflection coefficient with an average of 0.26. This study shows that the steeper the slope angle, the better the floating breakwater structure is in reflecting waves, and vice versa. Regarding slope porosityPorosity, the smaller the percentage of porosityPorosity on the slope, the smaller the floating breakwater structure will reflect waves.