三峡工程规模巨大、技术复杂，针对重大技术难题，汇集全国科技精华，充分发挥专家的作用，展开科技攻关，并借鉴国外先进经验，科学决策。2003年6月1日水库开始蓄水，6月10日水位到达135 m高程，6月16日双线五级船闸试通航成功，左岸电站首批水轮发电机组从7月份开始投产，到2003年底已有6台机组正式并网发电。三峡工程已经顺利地实现了蓄水、通航、发电的二期工程建设目标。在枢纽总布置及大坝工程、水电站工程、双线连续五级船闸、特大型水轮发电机组、导截流及围堰工程和特大型工程管理技术研究及实践方面，取得了一系列重大突破。

The Three Gorges Project (TGP) has the characteristic of engineering largeness and technology complexity. The Three Gorges Reservoir started storing water on June 1, 2003, and water level reached 135 m on June 10. The double-way consecutive five-step ship locks succeeded trial navigation on June 16, 2003. The first hydro turbine generator units were put into operation on left bank in July, there were 6 sets hydro turbine generator in operation at the end of 2003. The Phase Ⅱ construction of TGP, in terms of storing water, navigation and power generation, has been finished. Breakthroughs have been made in a number of key technology problems, such as the TGP general layout and dam engineering, power station, the double-way consecutive five-step ship locks, super - hydro generator set, river diversion, river closure and cofferdam, research and practice of giant project’s management, etc.