Considering characteristic of different material zones of dam foundation in computation model , the compatible displacement method for incompatible mesh is presented in this paper , it is convenient for considering the interaction between the arch dam body and the dam abutment . therefore , the mesh of dam body can be generated with 3d hexahedron elements but that of dam foundation is generated with 3d tetrahedron elements 针对计算模型中坝基材料复杂、地质构造丰富的特点，提出了“典型面控制法”和坝基用空间四面体单元离散，坝体(包括附近区域)用空间六面体单元离散的非一致网格协调位移解法。
