Abstract: The embedded concrete composite dam is a new type of dam which can improve the stress and deformation conditions of a high concrete face rockfill dam. Further analysis of the influence of the concrete structure of the heel of the dam on the stress and deformation of the embedded concrete composite dam has been investigated in this paper, based on analyses of the stress deformation of the concrete slabs and the displacement of the peripheral joints of different heights and the downstream slope ratio and the different positions of the plinth. The results have shown that when the height of the concrete structure of the heel of the dam was increased from 0.27 times to 0.4 times the height of the dam, the deflection and the stress along the slope of the face slab were greatly reduced, and that when the downstream slope ratio of the concrete structure of the heel of the dam was reduced from 1:0.4 to 1:0.7, the variation in the stress and deformation of the face slab was relatively small. When the position of the toe plate was changed from downstream to upstream at the top of the concrete heel of the dam, the opening displacement and dislocation displacement of the peripheral joint between the face slab and the toe slab decreased significantly by 68.7% and 85.8% respectively. The results show that the stress and deformation of the face slab could be effectively improved by setting the concrete structure of the heel of the dam.