Abstract: Based on the ME-Tennant method,this paper defines the ecological flow process level,and constructs an ecological operation model with the highest ecological flow process level and maximum power generation as the operation goal. The improved NSGA-Ⅱ algorithm is used to solve this model,which is used to repair the dewatering reaches of the downstream ecological degradation of the dam. The model is applied to the Kuaizilou-Shuikou Cascade Hydropower Station in Hunan Province,and the results show that the ecological flow and the power generation flow are in a competitive relationship. As the level of the ecological flow process increases,the power generation will also decrease. The power output of the selected reservoir scheduling schemes for the wet year,the normal year,and the dry year are 114.87,84.44,and 61.39 million kWh respectively,the ecological flow process levels are all at the“very good”level,ensuring the power generation and meeting the high-level ecological water demand for the restoration of ecologically degraded rivers to a healthy state. The research results can provide reference for the ecological operation of reservoirs with ecological degradation problems.