In recent years, countries and regions worldwide have set goals to increase the proportion of new energy source in their energy transition plans. However, the intermittent nature of new energy sources, represented by wind power and solar photovoltaics, necessitates the support of flexible resources like pumped storage and hydropower. This study takes the established Liyuan and Ahai Hydropower Stations along the Jinsha River as typical cases, thoroughly exploring the potential benefits of utilizing the reservoirs of these two stations to construct a Liyuan-Ahai hybrid pumped-storage power station. Through comprehensive analysis, we propose an installed capacity scheme that aims to maximize the benefits of the three power stations. This scheme not only provides a feasible reference method for the design of similar engineering projects, but also holds significant importance in promoting the efficient utilization and sustainable development of hydroelectric energy. We hope that through this research, we can provide valuable reference and inspiration for experts and scholars in the field of hydropower engineering.