Based on the gravity ship lock chamber structure,the finite analysis software ABAQUS integral algorithm was used to establish the three dimensional finite element model of ship,lock chamber structure and soil.The process of collision was simulated to obtain the impact force-time curve and the value of impact force in different working conditions.The results show that the normal average value of ship impact force is linear with the square root of ship displacement,the first power of impact velocity,the first power of impact angel.Comparing the normal average value of ship impact force of software simulation with the calculated value according to JTJ 307—2001 Code for Design of Hydraulic Structures of Shiplocks,it can be concluded that the calculated value is relatively small,and the influence of the ship impact force to lock wall is underestimated.