Due to the lack of mature theoretical system

the research progress of p-y curve is slow. With the consideration of the actual stress state of foundation soil and deployment of Vesic expansion theory

a new method for analysis of p-y curve based on stress increment is developed. This method combines the contributions of soil radial stress increment

longitudinal stress increment effect and deep rotation angle of pile to the horizontal soil resistance. It is a type of solution of p-y curve considering various factors. The method can be applied to different type of piles. The case results show that this method is correct and accurate in analyzing the behavior of laterally loaded pile. It produces better precision in large deformation analysis than Reese

API and Kim methods. The above research result is of great significance for in-depth study of the p-y curve development.