Pile-soil interaction plays important role in lateral loaded pile research. Soil pressure caused by interaction is the nonlinear function of displacement and depth. That is the displacement and stress of pile behaves nonlinear relationship

which results in complexity of analysis and calculation. In allusion to the complexity of the lateral loaded pile

it begins with Rankine’s earth pressure theory considering displacement. This paper deduces the calculation formula of soil pressure around the pile according to the displacement caused by deflection of pile. The formula can be used to calculate soil pressure based on displacement at any point without regard to foundation model. Compared to other analysis theory

this approach is simpler. In order to verify the rationality of the formula

authors take an example to set forth the process of analysis and calculation. The results are in accordance with the results of that p-y curve theory and practice.