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在本文中主要讨论了下述三个问题：（１）梯级正常高水位之确定；（２）根据电力系 统开支为最小原则确定梯级电站最有利之水库工作深度；（３）梯级电站枯水年之蓄水次序。 在论证梯级最有利之正常高水位时，考虑到梯级电站之修建次序不同以及投入运转之时 间不同，梯级电站参数选择之互相影响问题。 根据电力系统开支为最小原则确定梯级电站之最有利工作深度方法可用于技术设计和运 转设计。 梯级电站之蓄水次序是根据蓄水期梯级电站获得最大电能的原则，并满足下述三个条 件：（1 ）梯级电站按保证出力工作；（２）尽量使梯级水库都蓄满；（３）尽量不使各级 电站弃水。根据推导出的公式可绘制梯级电站之调配图。
In this paper, the following three issues are mainly discussed: (1) the determination of the normal high water level of the cascade; (2) the determination of the most favorable reservoir depth for the cascade hydropower plant based on the minimum power system expenditure; (3) The order of the water. When demonstrating the most favorable normal high water level in a cascade, taking into account the different order of construction of the cascade hydropower station and the different time of putting into operation, the mutual influence of the parameter selection of the cascade hydropower station is considered. The method of determining the most profitable working depth for a cascade plant based on a minimum principle of power system expenditure can be used for both technical design and operational design. The order of water storage of cascaded power plants is based on the principle of obtaining the maximum power of cascaded hydropower plants during the storage period and meets the following three conditions: (1) cascaded power plants work according to the guaranteed output; (2) try to make the cascaded reservoirs full; and Try not to waste water at all levels of power plants. According to the derived formula can be drawn cascade plant deployment map.