Abstract: Flood forecasting and reservoir flood operation are important technical means to realize the "FEDE" (forecasting, early warning, drilling, and emergancy plan) of basinwide flood control. Taking Shanxi Reservoir, Baizhangji Reservoir and Zhaoshandu Drinking Water Project in Feiyun River Basin in Zhejiang Province as examples, this paper analyzes the spatial relationship and hydraulic connection of various water projects in the basin, and establishes a distributed Xin'anjiang model for flood forecasting at important nodes in the basin, which is used as the input of the control joint optimization flood operation model of reservoir groups and solves the model. The results show that during the period of defending against the No. 1617 typhoon "Megi", the joint optimization flood operation of reservoir group considering flood forecast information can further play the potential of flood control in reservoirs, and the peak shaving effect of Zhaoshandu section in the downstream is obvious.