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A consolidation theoretical solution of rigid-pile composite foundation, which takes the modulus of cushion, pile and soil in consideration, was derived on the basis of saturated sand drain well consolidation theory. The FEA model of a single pile composite foundation was established in ABAQUS adopting the Modified Cam-clay constitutive model and pore element to simulate the soil between piles. The calculation fit well with the experimental results, which proved the validity of numerical simulation. The influences of thickness and modulus of cushion, the length of pile on the mechanical and consolidation settlement of rigid-pile composite foundation were further analyzed. The results show that : the consolidation rate of rigid-pile composite foundation is quite faster than natural foundation ; the consolidation rate is faster with larger cushion modulus and minor drain diameter ratio ; the consolidation is almost finished during the construction process ; the increase of cushion modulus leads to decrease of consolidation settlement, but the increase of thickness of cushion and drainage soil layer leads to the opposite effect. [ABSTRACT FROM AUTHOR]