Abstract: Joint operation of multi-reservoir is of great significance for flood control in a river basin.This study focused on coordination of the flood control objectives in joint flood control operation of hybrid reservoir group with multiple flood control points.Accordingly, a joint flood control operation model of reservoir group for multi-basin was constructed.Moreover, a hybrid algorithm, progressive optimality algorithm and successive approximation(POA-SA),was used to optimize the model, and the reservoir group of the Four Rivers in Dongting Lake Basin was selected for a case study.Based on the flood control demand and characteristics of each reservoir, an optimal model was established to jointly minimize the flood peaks on the downstream flood control stations of the Four Rivers Basin and the flood peak of the Four Rivers floods confluence into Dongting Lake.The joint flood control optimization scheduling scheme of the reservoir group in the Four Rivers in typical years was proposed.The results showed that:(1) through the joint optimization of reservoirs, the peak shaving rate of the Four Rivers floods confluence into Dongting Lake of the two floods in 1998 and 2017 increased by 9.4% and 4.5%,respectively compared with the individual optimization on the Four Rivers.(2) Among them, through compensation regulation, the Zhexi Reservoir on Zishui River and the Wuqiangxi Reservoir on Yuanjiang River realized the peak staggering of inflow flood.Therefore, the joint operation of the multi-reservoir systems can reduce the flood control risk of the Four Rivers Basin and reduce the flood control pressure of Dongting Lake at the same time.The research results can provide reference for joint flood control operation of multi-reservoir in river basin.