Abstract: In order to realize the working properties of the pile with cap under horizontal load,the properties of horizontal displacement and bending moment of pile under different horizontal loads have been researched by using the FLAC3D to compare normal pile with the pile with cap.Research shows that pile with cap can easly control horizontal displacement and bending moment.Simulation results are helpful for establishing the calculation model of pile with cap under horizontal load,perfecting the working character of pile with cap and optimizing engineering project.