Aiming at the waterway obstruction problem during the dry season of the Changzhou Water Conservancy Hub to the Jieshou River section of the Xijiang Shipping Trunk Line,we collect the hydrological and topographic map data in recent years to study the cause.The analysis of the hydrological characteristics and bed evolution of the engineering section reveals that the general decrease in water level and the change of channel erosion and siltation are the main reasons for the insufficient water depth of the channel during the dry season.The cross-flow of the curve also has an impact on the navigation safety of the ship.Engineering measures such as dredging and reefing,backfilling deep trenches,and smoothing the route are proposed.The study of the mathematical model of dimensional water flow shows that the water depth and flow pattern of the waterway have been improved after implementation of the channel regulation.The research ideas and results can provide reference for similar projects.