根据流固两相混合物连续介质力学理论，采用伽辽金加权残值法，选取固相位移、液相位移、孔隙水压作为场变量，对固液两相耦联方程进行有限元离散化，得到解耦方程组。然后在时域上采用Ｗｉｌｓｏｎ－θ法进行逐步积分，得到一种分析二维饱和孔隙介质地震反应的三场有限元方法。该方法不仅可以直接计算固相和液相位移，而且能直接得到地震期间孔隙水压的反应过程。文中详细推导了有限元法的计算公式，并给出了算例。 According to the continuum mechanics theory of fluid-solid two-phase mixture, the Galerkin weighted residual method was used to select the solid phase displacement, liquid phase displacement and pore water pressure as the field variables, Get the decoupled equations. Then the method of Wilson-θ method is used to integrate step by step in the time domain to obtain a three-element finite element method to analyze the seismic response of two-dimensional saturated porous media. This method can not only calculate the displacement of solid phase and liquid phase directly, but also directly get the response of pore water pressure during the earthquake. In this paper, the calculation formula of finite element method is deduced in detail and an example is given.