Pile foundation is the key to the whole structure of high-pile wharf.We establish pile-soil stress theory model,and analyze the pile,soil and their interactions in theory.Meanwhile,we apply the Fourier series convergence method to simply the symmetric inverse model for the computer to solve a given direction,use the language APDL on finite element analysis software ANSYS to build the pile-soil interaction model and load on it,conclude the regular on pile-soil overall deformation and side frictional resistance on pile with the depth,and compare the model results with the existing experimental results.The results show that Fourier series convergence method can change many elements into zero in the process of inversing stiffness matrix on symmetric model,in order to increase the computational efficiency of the computer.The overall displacement of pile and soil is small under different loads,and the friction resistance of pile and soil is piecewise linear,and the maximum stress reaches 32 m at the depth of embedment.In the project,more longitudinal bearing steel should be arranged.