Based on the revised results of the design flood in 2016, the south tributary of the Daqinghe River in the Haihe River basin was taken asthe research object to calculate standard flood with 100 year return period.Considering three kinds of dispatching modes for the five largereservoirs in the Baiyangdian Upstream including hierarchical controlling and dispatching, open drain scheduling after flood peak, and combineddispatching, the flood process into the Baiyangdian Lake was determined. Then, the impact of the different dispatching modes on flood control forthe Baiyangdian Lake was analyzed.