In order to study the influence of discharge of Wujiangdu hydropower station on navigation of Wujiangdu port,the two-dimensional unsteady flow mathematical model was established,and the model was verified with the nature water level and current.Navifation condition of steady flow was simulated and analyzed.According to unsteady flow on navigation discharges of the station,navigable hydrodynamics were studied by using velocity and river slope and water level change in 10 minutes during discharge.The influence of discharge for berthing was analyzed in the accordance with the ability of upriver ship.