Sloped embankment and vertical embankment are common breakwater structure forms. When the two are used to compare and select design schemes, the project cost is an important factor that must be considered in structural selection. By combining actual engineering cases, the influence of natural conditions, main material supply, construction difficulty, and construction period requirements on the project cost is analyzed. The results show that when the water depth is shallow and the stone source is abundant, the slope embankment has the advantage of lower cost; for the case of large water depth and special landscape use requirements, the vertical embankment can be considered.