During the construction period of west sluice of Suzhou River in the Wusong River project,a open diversion channel navigation method is adopted.There are many unfavorable factors such as bridge with piers in water,pump gates,high voltage iron tower,and bends in the upstream and downstream of the channel,making the navigation conditions complex.To ensure the safety of ship navigation and analyze the adaptability of water flow conditions in open diversion channel to ship navigation,a two-dimensional hydrodynamic numerical model is established using numerical simulation calculation methods.The flow state of water flow under various working conditions during construction is analyzed and calculated,with a focus on verifying the navigation water flow conditions in open diversion channel,upstream and downstream bridge areas,bends and other high-risk navigation sections.The results show that the flow conditions of the open diversion channel meet the regulatory requirements and are feasible for navigation.The relevant analysis provides a basis for the layout of open channel routes,determination of navigation technical parameters,and setting of navigation support facilities.The research results can provide reference for similar projects.