Abstract: In order to solve the vertical force on the top of foundation pile,according to the calculation of vertical force on the top of pile in the case of “all or part of the vertical stiffness of foundation piles are different”,“the vertical uplift stiffness and compression stiffness of the same foundation pile are different”,the complete calculation formula of vertical force on the top of pile and the corresponding “iteration algorithm of vertical stiffness of foundation pile” are given through analysis;on this basis,as to the pile foundation which needs to consider the action direction of horizontal load due to wind load,the automatic algorithm of the vertical force of pile top changing with the action direction of horizontal load is given.In practical engineering,when the vertical stiffness of foundation pile under rigid foundation distributes differently,when the action of horizontal load in different directions,the calculation of the control value of vertical force on the top of pile is quite complex;in this paper,the calculation method and the calculation program compiled given can solve this problem well,providing an accurate and efficient analysis tool for engineering design.