Since the navigable clearance scale of the railway bridges in the Laibin-Guiping Channel cannot meet the navigation requirements，and the first and second railway bridges are old and have geological diseases，the investment in the reconstruction of railway bridges is huge，and thus this paper determines the water level calculation control condition under the condition that the railway-related reach is not renovated.Based on the hydrological test data and water level calculation results，this paper establishes the water level-flow correlation between the channel in the railway-related reach and the upstream Qianjiang hydrologic station.Through the analysis of the flow assurance rate，the paper determines that the annual navigation days affected by the insufficient navigable height scale of railway bridges and channel width are 35.3.According to the characteristics of small ship flow in the near future，this paper determines the scheme of single-way navigation in the near future and double-way navigation except railway bridges in the medium and long term and arranges emergency berthing points at upstream and downstream respectively.The paper also puts forward suggestions on navigation safety guarantee measures and navigation rules such as layout monitoring，bridge anti-collision，navigation aid，and traffic safety signs，which can be used for reference in similar railway-related channel designs.