To counter the problem of navigation-obstruction under Shaxikou hydropower station due to insufficient water depth on sill and channel in the dry season and the large velocity and disordered flow pattern in the channel,we follow the regulation idea of building dams and open channel combined with reef blasting to adjust the diversion ratio,raise the water level of the shiplock gate and channel during the dry season,adjust the flow state,and improve ship navigation conditions.Adopting the 1:50 physical model test to study the waterway regulation scheme,and according to the problems existed in the design scheme,we analyze multiple schemes.By the optimized scheme,the water depth on sill and channel,flow velocity and flow pattern satisfy the design requirements.