Abstract:Through analyzing the flood control operation of the great flood disaster in Dayu county on the July 3th in 2009,the article concludes by suggesting general idea of flood control operation of“joint dispatch,storage and discharge,scientific pre-discharge,peak load reduction”,which not only combines the characteristics of the local physical geography and economic development,but also takes into account the current situation of the river and the characteristics of floods,It provides a reference for the reservoir flood operation in mountainous counties and good results have been achieved in practice.