Current pile design methods lack special treatment on the coupling of inclined loads, so the actual conditions of high-piles can’t be reflected accurately. A method for calculating the coefficient matrix of lateral nonlinear springs, which is very applicable in finite pole element analysis, is proposed based on the concept of Newmark spring and the p -y curves formula. Then, The finite element program, which considers the P-effect, is compiled on the basis of the analysis model, and applied to analyze real projects. The correctness and feasibility of the presented model is confirmed by comparing the results of this study with testing piles.Moreover, the influence degree of the rotation on the pile top and P-驻effect is analyzed.