Abstract: A systematic study has been carried out on the effects of three-dimensional wave forces of vertical pile array, applying method of wave source distribution on arbitrary sectional contour of the piles The piles involved in computation reach up to 100 Some new properties of hydrodynamic interaction among piles are obtained It should be emphasized that the forces on piles shows continuous dependence when the piles number increases over a certain number When the number is very large, forces on the mi...