Abstract: Based on the dynamic test of the pile in soft soil area, the interaction of pile and soil is analyzed by finite element method. Commonly used equivalent linear model is chosen to consider the nonlinerity of soil, material damping of pile is considered and the changing-status nonlinearity of soil-structure interface is considered by contact element. Parameters of pile and soil influenced on pile’s displacement were analyzed. The results show, there is some influences on pile top’s displacement as a result of a change of pile’s modulus of elasticity and material damping; and the pile’s displacement become smaller with the pile’s modulus of compressibility and material damping increasing.

Key words: finite element method, material damping, displacement, modulus of compressibility