The wave seepage forces on vertical circular cylinder resting on porous elastic seabed in two layer ocean has been investigated by applying the eigenfunction expansion approach. The analytical solutions to seepage pressure fields caused by surface wave and inner wave respectively are given and

accordingly

the formulas of the waveinduced lift force and moment caused by the seepage pressure on the bottom of vertical circular cylinder are derived and evaluated. The results reflect possible changes of wave seepage forces on the bottom of vertical circular cylinder in two layer. It is demonstrated that inner wave may have an obvious influence on wave seepage forces.