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Based on a linear model of the pressure difference between two sides of a porous wall and the fluid velocity inside it, an analytic solution is established for wave diffraction from a cylinder with an outer porous column and an inner solid column. Numerical experiments are carried out to examine the effects of the wave force on a porous tow-column cylinder and the wave elevations outside and inside the cylinder due to the porous character of the outer column and the ratio between the radii of the inner and outer columns. The numerical results show that the increase in the coefficient of porosity of the outer column of a double column cylinder will reduce the wave elevation around the cylinder and the wave load on it. The radius of the inner column does not affect too much the wave elevation around the cylinder and the total force on the cylinder.