For the limitations of the wave dissipation performance of traditional permeable breakwaters，we innovatively propose a pile foundation breakwater with low permeability based on closely spaced battered piles.It realizes full shielding of the wave face by setting rib plates on the pile side and crossing the front and rear axes of the pile positions.We analyze the stress characteristics of a closely spaced battered pile structure base on a land-island traffic wharf project.Then we study the design details of closely spaced battered pile，rib plate，lifting lug and superstructure connection and put forward corresponding solutions.The results show that the transmission coefficient of this type of breakwater can be reduced to below 0.2，and it is suitable for waves of higher heights and longer periods.