Abstract: Three-dimensional refinement modeling is carried out for the dam body, dam foundation, face plate and impervious curtain of Daigusi concrete face rockfill dam (CFRD). Self-developed three-dimensional seepage calculation and analysis software DUT-SEEPAGE is used to calculate the seepage situation, emphasizing on the study of the characteristics of seepage field distribution and the anti-seepage effect by the joint action of face plate and impervious curtain, and the variation of dam leakage with permeability coefficient of dam base. Finally, the effect of the permeability coefficient on the infiltration line of the dam when there is a fracture zone in the dam foundation is analyzed. The results suggest that the anti-seepage effectively blocks the infiltration of the upstream water flow and plays a very good impermeable effect, which can ensure the safe operation of the dam. The change of permeability coefficient of the extrusion fracture zone has little influence on the position of the dam infiltration line, but the distribution of pore water pressure and total head changes greatly. Moreover, when the permeability coefficient of the fracture zone is large, the hydraulic gradient will also increase, resulting in the potential risk of seepage damage around the fracture zone.