Abstract: Embedding a concrete dam at the upstream bottom of the conventional CFRD' s slab is called combined "CFRD". Studies and analysis of stress and deformation properties of the combined CFRD using 3D finite element method based on a 150 m high dam are introduced in this paper. The analysis results show that the rock-fill deformation of the combined CFRD is not much different from that of the conventional CFRD. However, because the length of the dam slab and the vertical joints are reduced, the stress state of the dam slab is improved. By extending the dam crest width of the concrete dam, the deformation of the peripheral joints can be controlled. At present, the most prominent problem existing in the 200 m high concrete-faced rock-fill dams is the structural cracks and crushing failure of the dam slab, and the combined CFRD can effectively improve the slab stress state. So the combined dam has some technical advantages, especially under the conditions of irregular terrain, narrow valleys and other adversity. Therefore, this new dam type can provide a new idea in the design of the high CFRD.