In order to evaluate earthquake damage to earth dams quickly and accurately

more rational influence factors of the damage are chosen based on the empirical model. The least square method is used to re-analyze the earthquake damage data of earth dams. The regression coefficients of the influence factors of earthquake damage under different conditions are presented; and an improved empirical model to evaluate the earthquake damage to earth dams is set up. In the new model

irrational influence factors are eliminated; and the prediction accuracy of the regression model is improved with the correlation coefficient of 0.908 and the standard deviation of 0.459

which are better than the original model. By using both the improved and original model

47 earth dams damaged in Wenchuan Earthquake are evaluated. The results are analyzed by comparing with the real seismic damages

preliminarily proving the improved model to be more satisfying.