Abstract: The pile driving of a container terminal is close to the large-diameter tunnel to be built,with the length of pile being up to 55 m and the diameter of tunnel being about 18 m.To analyze the potential vibration of the tunnel affected by pile driving,the vibration was simulated with FEM.The problem was the dynamic reaction of the whole system consisting of piles,soil and tunnel under the impact load of pile driving.The mechanical relationship among piles,soil and tunnel was the key and difficulty for such kind of problem.In fact,it was the relationship of dynamic contact under dynamic load.According to the transient analysis and contact elements of ANSYS,and based on the verification of a practical project,the problem was successfully simulated by setting up dynamic and contact parameters reasonably,then the vibration of tunnel under the impact load of pile driving was analyzed.Important parameters including safe distance,pile length and energy of pile driving were provided for reference.