Guangyangba reach is one of the navigable bayonet reaches from Chaotianmen to Fuling reach in the fluctuating backwater area of the Three Gorges. Traffic control is required to ensure navigation safety during the ebb and flow period, which seriously restricts the passage capacity of this section. Aiming at the problem of poor channel condition in fluctuation period of Guangyangba reach, the riverbed evolution is analyzed by using the method of real measured topography comparison, and the navigation-obstructing characteristics are discussed. On this basis, the regulation scheme to improve the channel condition and the channel dimensions is put forward, and the regulation effect is analyzed, which can provide support for improving the channel dimensions of Chaotianmen to Fuling river channel.