By numerical simulation,we compare pile test results and simulation results and verify the applicability of the calculation model,calculate the distribution of internal force and displacement of pile under different load levels to analyze the stability of pile,analyze the stress state of the soil to study the disturbance of the horizontal load to the soil.The research result shows that when the pile is subjected to long-term lateral loads,the pile will be subjected to continuous shearing action,and the integrity of pile should be tested regularly;under the horizontal loads,the soil around the pile is affected by the shear and tension.