For the navigable water flow conditions at the front of the wharf in the backwater area of the reservoir under the influence of large stage fluctuations，we take Baishitan wharf being built in downstream of the Baihetan Hydropower Station as an example to study the navigable flow conditions of the Baishitan wharf by grading the water levels for the large stage fluctuation and adopting the method of two-dimensional hydrodynamic numerical simulation. As a result，the linear relationship between the highest navigable flow of the wharf and the graded water level is obtained：the higher the water level in the front of the wharf，the better the navigable flow conditions. When the water level of the wharf reaches 585 m or more，the water flow conditions at all discharges of the navigable water area in the front of the wharf meet the requirements for safe docking and navigation of ships. The results indicate that the design plan of the wharf to operate during the higher water level after completion is feasible.