The flow conditions at the inlet of a ship lock are related to the efficiency of the water conveyance system and the safety of ship berthing.The layout of the inlet is an important part of the hydraulic design and model testing of the ship lock.This paper focuses on two common types of inlet layout,combined with the specific conditions of the water conveyance system of a ship lock,and uses numerical simulation methods to compare and analyze the impact of these two types of inlet layout on the water conveyance system from the aspects of water conveyance hydraulic characteristics and flow state.The results show that for the lock wall long corridor ship lock water conveyance system,the engineering measures of diagonal pulling of the outer guide wall of the water inlet have more advantages in controlling the ultra-high inertia and the maximum rising speed of the gate chamber water surface,enhancing the stability of the flow process of the inlet branch hole,and improving the flow state of the water inlet relative to the outer guide wall of the inlet.The results can provide technical reference for the layout of the inlet of the lock water.