Wenchuan Earthquake caused many reservoirs damaged. According to the basic situation of earthquake-damaged reservoirs in Sichuan province,the Hongqi reservoir in Cangxi county was taken as a typical earth rockfilled dam example for renovation analysis. Before renovation, the minimum safety factors against sliding of dam slope were only 1.098 ~ 1.145,less than the specification required values ( 1.15 ~ 1.25), as the water level dropped from exceptional flood level, design flood level and normal water level to dead water level. Through treatment and reinforcement, the values improved to 1.262 ~ 1.698 and met the requirements of specification. Finally, seismic resistance analysis was carried out to study the stability of the dam slope after renovation, and the seismic safety factors were 1.451 ~ 1.654 which met the specification requirements. The results of the statistical data and the renovation of a typical earth rockfilled dam provided a reference for other similar earthquake-damaged reservoir.
