Abstract: In response to the "dual-carbon" strategic goals and to accelerate the integrated development of renewable energy in river basins, this study focuses on the power configuration of integrated hydro-wind-solar energy bases. It analyzes influencing factors such as the characteristics of wind and solar resources, the regulating capacity of hydropower, transmission corridor availability, and load center demand, while also outlining technical pathways for power configuration. Based on the regulating capacity of conventional hydropower and the scale of wind and solar resources within a basin, the power configuration methods are categorized into three models. The resource characteristics, configuration approaches, and outcome patterns of each model are examined. The results from these three models are synthesized into a formula to quickly estimate the upper limits of power configuration ratios for conventional hydropower, pumped storage, and renewable energy sources. This provides a simple and practical quantitative analysis tool for the planning of integrated hydro-wind-solar energy bases. An application analysis was conducted based on the resource characteristics of four regions: the lower Jinsha River, the upper Jinsha River (Sichuan-Xizang section), the upper Lancang River (Xizang section), and southeastern Xizang. The findings indicate that in basins with strong conventional hydropower regulation capacity but common wind and solar resources, full utilization of existing hydropower flexibility is essential to facilitating the development of adjacent renewable energy projects. In regions where both conventional hydropower regulation strength and wind-solar resources are abundant, priority should be given to maximizing the regulatory function of hydropower, supplemented by capacity expansion and pumped storage plant construction, to enable large-scale development of renewable energy. For basins characterized by limited conventional hydropower regulation capability yet rich wind-solar potential, conventional hydropower should serve as a foundational support for grid stability and energy supply, while the deployment of pumped storage stations becomes crucial to unlocking large-scale renewable energy development. These research outcomes offer valuable technical support for optimizing future development planning and enhancing resource utilization efficiency.