In order to give full play to the economic and ecological benefits of the Three Gorges Reservoir( TGR),a multi-objective reservoir optimal operation model is established with the target of maximizing the hydropower output from the Three Gorges Hydropower Station and minimizing the variation of the ecologically suitable flow in the downstream channel,while the ecologically suitable flow in the downstream channel is quantified based on the eco-hydrological method concerned. For effectively solving the problem...