Aiming at the shallow bending of the Xinhekou channel in the Xinglong reservoir area of the Hanjiang River after implementation of the first ecological dispatch of cascade hubs,we analyze the hydrological conditions,river bed evolution and channel scale,probe into the influence of the ecological dispatch of the cascade hubs on the navigation channel,and predict the development trend of the navigation channel in the reservoir area.The results show that the water level of the Xinglong Reservoir rises sharply during the ecological dispatching,and the flow rate is larger than that of the downward flow.The stability of the channel in the transitional section from Maliang to Shayang reach of the Xinglong Reservoir is poor,the duration of ecological dispatching is short,and the channel in the transitional section after the impoundment of the Xinglong Reservoir is prone to navigation obstruction due to the lack of sufficient flow scouring duration.It is predicted that there may be channel oscillation in the transitional section from Maliang to Shayang in the long term,the channel will be silted up,and the channel conditions may deteriorate further.