Abstract: For concrete face-slab rock-fill dam (CFRD) constructed on deep alluvium, the stress and deformation properties of dam, foundation, face slab and diaphragm wall were studied by numerical analysis. Furthermore, the interaction of dam foundation and alluvium was analyzed. The study result showed that although the foundation deformation had a significant impact on the stress and deformation of dam, face slab and diaphragm wall, it was still feasible to built high CFRD with its plinth on alluvium foundation.