In consideration of the high sediment concentration in Jinghe River and the complexity of the power station operation,the characteristics of water and sediment in Jinghe River and their effects on power generation were studied by analyzing the hydrological data of water intake of power station from 1994 to 2009.Results showed that annual runoff and sediment yield presented a significant trend of decrease,which was closely related to the construction of soil and water conservation in Jinghe River basin.Runoff and sediment were unevenly distributed during a year,mainly in the flood season,and the amounts accounted for 64.6% and 92.6% of the whole year,respectively.However,sediment concentration in flood season was still high.Based on the change characteristics of water and sediment in Jinghe River,the effects of water and sediment on power generation were further discussed and several countermeasures ensuring the normal operation of the power station under high sediment concentration were preliminarily given.