The Duncan-Chang nonlinear constitutive model is used to carry out a 3-D finite element analysis for the Xiabandi asphalt concrete core rockfill dam with deep overburden(147.95m).In the study,the characteristics of stress and displacement in the seepage prevention wall with deep overburden were analyzed, and the rule of stress and displacement change in the seepage prevention wall during engineering completion and water impounding operation period according to eight kinds of characteristic parameters change were given.As well,the paper provided reference for material selection of the seepage prevention wall.