Bending channel is common in inland waterways. Due to the complex flow conditions, which increased the difficulty of ship maneuvering, we need to regulate the bending channel to improve the navigation conditions. The bending channel’s 3D flow model and ship maneuvering motion numerical mode are jointly used in Yiyang to Lulintan waterway project to evaluate navigation conditions based on the simulation results, which provide a scientific basis and guidance for the regulation project of bending channel.