To the limitation of various factors such as river terrain conditions and overall layout of a ship lock,the upstream approach channel obliquely passes through the mainstream of the river and has a large intersection angle,and the lateral flow velocity of the navigable water is high.Numerical simulation and hydraulic model test are used to observe the overall upstream flow conditions of a newly built lock,and the optimization engineering measures combining the adjustment of the upstream route and the cutting of the convex bank are proposed and analyzed.The results shows that the above measures can effectively improve the navigable water flow conditions in the upstream approach channel,with a significant reduction(about 33%)and a decrease(about 69%)in the number of flow velocity values and measurement points in entrance area exceeding 0.30 m/s compared to before optimization.The research results can provide reference for similar projects.