The dam of Three Gorges Project is characterized by large flood discharge capacity, more outlets complicated flood discharge and energy dissipation structure etc., the gentle-dip structural plane of the bedrock in powerhouse dam section endangers the dam foundation stability due to the deep excavation of powerhouse at the dam-toe. For the dam body concrete, the durability requirement is high as well as the temperature control and crack prevention are difficult. There is a lack of practical experiences in the design and construction of asphalt concrete core wall for Maopingxi protective earth-rock dam. The power station operates with high water head and large head variation. The type selection of penstock and intake as well as the embedding way of spiral case are complicated in technique, and the tailrace tunnel with sloping ceiling of underground power plant is arranged instead of traditional tailrace surge tank. For the double-line five-step ship-lock, the design of fully lined ship-lock, high head delivery system and large-sized miter gates and hoists is very difficult due to high operation head, complicated delivery conditions and building in deep excavated rock. The preferred solutions, optimal schemes and technical measures for various structures, as well as the innovation achievements proved by practice are highlighted.