Abstract: Based on the Biot’s consolidation equation,Novak’s thin layer method was applied to the study of pile-soil interaction in saturated soil.The potential functions were introduced to decouple governing differential equations,then by virtue of differential operator splitting and variable separation method combined with the assumption of perfect contact between the pile and the soil,impendance function of pile-soil interaction was obtained.The comparisons between Novak’s single-phase solution and the tow-phase solution were presented.A parametric study was conducted to determine the main features of pile-soil interaction during horizontal vibration.As a result,there were some effects of permeability coefficient,pile-soil modulus ratio and pile slenderness ratio on the impedance of rocking,horizontal and coupled horizontal-rocking vibrations of single pile.