The Shuijing Bay Beach section is a branching channel in the upper reaches of the Yangtze River，which has various navigational characteristics such as rapid，shallow，and dangerous.The difference in flow during flood and dry season causes changes in the diversion ratio and sediment distribution ratio of the main branch，resulting in unstable riverbed.By using numerical simulation combined with the initial plan for the layout of spur training dike，the navigable flow conditions and the variation laws of the diversion ratio of the inlet channel at different deflection angles of spur training dike head are studied.The calculation results of each layout plan are compared and analyzed to obtain the optimal plan for the layout.The results show that there is no positive relationship between navigation flow conditions and the deviation angle of spur training dike head，and there is a suitable range for the deviation angle of the dam head.The diversion ratio of the branching main channel varies inversely with the flow rate，and the deviation angle of the dam head has little impact on the diversion ratio of the channel.The results of this study can provide theoretical basis for the subsequent waterway regulation schemes of similar rivers.