Abstract:Gezhouba hydropower station has been operating for 30 years since its first generating unit was combined to the grid in July 1981. In order to make full use of hydropower and improve the comprehensive benefits of Three Gorges hydropower station and Gezhouba hydropower station,China Yangtze power co. ,LTD tries to increase the capacity of the generating units of Gezhouba Dajiang hydropower station. Dongfang Electric Machinery Co. ,Ltd. carries out the capacity expansion of 6 sets of water turbines.