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莲花水电站技施设计阶段，在修编初设的基础上，经勘测设计试验论证，进行了大量的设计优化。主要有用砂砾石代替部分大坝堆石料；大坝垫层、过渡层料设计优化；二坝心墙防渗土料改用大坝坝基开挖料；二坝坝基取消灌浆廊道；溢洪道泄槽段缩窄；厂房尾水管用混凝土衬砌取代钢衬；厂房吊车梁设计优化；引水隧洞进水口布置优化；导流洞洞身由钢筋混凝土衬砌全部改为锚喷支护衬砌；调压井由简单式圆井改为阻抗式双圆弧调压井；厂用电高压系统设计优化等。不仅节省了大量工程投资，而且加快了施工进度。
During the technical design phase of Lotus Hydropower Station, a lot of design optimization was carried out on the basis of initial design and revision of survey and design test. The main use of sand and gravel instead of part of the dam rockfill material; dam cushion, transition layer material design optimization; two dam core wall anti-seepage material to dam dams excavation materials; second dam foundation to cancel the grouting corridors; spillway spillway Section narrow; concrete lining of the factory pipe instead of steel lining; plant crane beam design optimization; diversion tunnel inlet layout optimization; diversion tunnel body by the reinforced concrete lining all replaced by bolting and shotcrete lining; surge shaft by simple Type wells to impedance double arc surge wells; plant high voltage system design optimization. Not only save a lot of engineering investment, but also speed up the construction progress.