Taking Baihetan Reservoir area of Jinsha River as an example，for the fluctuating backwater section of Laojuntan，the river bed gradient is large，and the regulation measures can not be adopted to meet the requirements of the planned waterway grade.The traditional combination scheme of guaranteed discharge and water level in front of dam does not accord with the actual shipping requirements and navigation conditions.The method of simulating the operation of Xiluodu is discussed，and the design minimum navigable water level is determined comprehensively considering the influence of backwater of Baihetan and the regulation measures.At the same time，the natural condition and the navigation guarantee rate after the regulation measures are calculated in sections for the navigation channel regulation decision.