Based on Biot seepage consolidation theory and wave diffraction theory

the analytical solutions to the diffracted water wave potentials and the waveinduced seepage pressures referring to porous compound vertical circular cylinder resting on permeable elastic seabed are derived by applying the eigenfunction expansion approach

and then the wave-induced lift force and overturn moment caused by the seepage pressure on the bottom of compound vertical circular cylinder are accordingly evaluated and are compared with direct diffracted wave force and moment. The results demonstrate that the porosity of the lateral surface of the circular column resting on a circular base will lead an obvious reduction in direct horizontal wave loads on compound cylinder and certain reduction in seepage overturn moment on the bottom of compound cylinder

and having slight influence on direct vertical wave loads and waveinduced seepage uplift force on compound cylinder .The variation of ocean condition and structure geometry condition may have some influence on waveinduced seepage loads

especially on seepage moment. In certain condition

wave-induced seepage loads may have same order of magnitude as the direct wave loads.