In this paper, three-dimensional(3-D) finite element(FE) method is used to analyze the stresses of face slab of the 300m high concrete face rockfill dam(CFRD) before and after earthquake. Meanwhile, the effect of valley shape on the stress of face slab is considered. The results show that the maximum deflection and axial stress are located near the bottom of face slab in the central valley area before earthquake. And there are compressive stresses in mostly area of face slab. After earthquake, the positions of maximum deflection and axial stress of face slab were changed to the crest of the central valley area. As the valley aspect ratio increases, compressive stress of face slab decreases. For the 300m ultra-high CFRD, the maximum axial stresses exceed the concrete compressive strength before and after earthquake. Therefore, the compression damage of face slab should be considered during the design.