Based on the theory of saturated porous medium, considering the influence of the three-dimensional effect of the pile body, the longitudinal vibration study of large-diameter piles in saturated soil is carried out. Using the saturated porous medium theory and the assumption of Novak thin layer method, the shear stiffness of the soil around the pile is obtained. Combined with the initial conditions and boundary conditions, the Laplace transform is used to obtain the analytical solutions of the pile top impedance function and the frequency domain response function, and the semi-analytical solution of the time domain response function is obtained through the convolution theorem and inverse Fourier transform. . Firstly, the influence of pile-soil parameters on the dynamic response of large-diameter piles was analyzed, and the influence law of each parameter on the vibration response of large-diameter piles was obtained. In comparison, the calculation results are similar, which mutually verifies the correctness of the three models, which can provide theoretical basis and guidance for actual working conditions.