The construction qualities of earth dams built in the fifties to seventies of the twentieth century are usually worse and their foundations are the silty soil which has low density and is quite easy to be liquefied under the action of earthquake. It’s necessary to estimate their aseismic safety and study on the corresponding aseismic measures. Aiming at Qing-an Reservoir

the three schemes

such as concrete continuous wall

vibro-replacement stone column and rock pressure

are analyzed by FEM; and the reasonable engineering measure which may be widely used in the analogous project is recommended.