This article is focusing on analyzing the seepage stability of a certain concrete face rockfill dam, by using three dimensional stable seepage finite element method based on ANSYS. Researching the distribution of seepage field and seepage stability about seepage control measures of the engineering design, and the Influence about seepage field of dam seepage field by changing permeability coefficient of concrete face and impervious curtain，evaluating the effectiveness of the seepage control measures. The result of analysis shows that the effect of dam seepage control system is good for Effective controlling the distribution of the seepage field in the dam; the quality of the construction process for seepage control system should be strictly controlled ,because the permeability coefficient of the concrete slabs and anti-seepage curtain have a greater influence on the change of dam body seepage field.