Reasonable anti-collision reinforcement of the gate structure can effectively reduce collision risks and ensure the safe operation of the ship lock.To study its collision avoidance effect,taking the triangular gate of a ship lock as the research object,using the finite element software ANSYS,three kinds of models are built:before reinforcement,after reinforcement (straight-line anti-collision plate) and after reinforcement (broken-line anti-collision plate).Considering the open and closed status,forward and reverse water levels and different impact point positions,17 working conditions are constructed.The stress and deformation of the main components and the support reaction at the pivot seat and hoist rod under different working conditions are compared and analyzed.The results show that,when the ship impact force is not considered,the maximum stress of each component of the gate after reinforcement is reduced under the forward water level,but the maximum stress of the panel and main beam increases by about 30% under the reverse water level.Under the impact force of the ship,when the ship hits the column and the middle straight arm,the maximum stress of the gate component with the straight-line anti-collision plate is 30%-40% lower than that of the broken-line anti-collision plate,and the maximum deformation is reduced by about 50%.The anti-collision performance of the straight-line anti-collision plate is better.