The ultimate deformation of pre-stressed high-strength concrete PHC pipe pile under monotonic load is an important parameter to judge the structural damage.In order to solve the effect of pile and soil parameters on the ultimate deformation of PHC pipe pile under monotonic load,we establish the finite element model of PHC pipe pile considering pile-soil interaction by the fiber beam element model of ABAQUS software and the common node method,and use the P-ysoil spring to simulate the pile-soil interaction.We apply UCONCRETE03 constitutive model and USTEEL02 constitutive mode,and analyze the influences of reinforcement ratio,buried depth,undrained shear strength of soil,and axial compression ratio on the ultimate deformation of PHC pipe pile.The results show that the ultimate displacement of PHC pipe pile increases with the reinforcement ratio increasing,and decreases with the depth,undrained shear strength of soil,and axial compression ratio increasing.