This paper presents the elasto-plastic numerical and experimental results of Xiluodu arch dam-foundation system by employing a new FEM-TFINE code, fast Lagrangian method (FLAC-3D) and a geological mechanics model test whose scale is 1:250. By analyzing and comparing the numerical and experimental results, it is indicated that the results of numerical simulation agree well with the experimental results, and the dam failure mode of the left abutment is different from the right side because of different types of dam figures and geological conditions. The dam-foundation system is relatively poor so far as the whole system is considered. Firstly, the local slip fracture is formed on the foundation, then extends along the bottom of dam, and leads to instability and final failure. Thus, to reinforce the foundation or adjust the type of dam figure is suggested.
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