Materials suitable for the complex geological condition of Wudu project were developed. Geomechanical model and 3D FEM model were set up to study the foundation stability of the dam reinforcing scheme, and the safety factor Kcof the 16#~19# dam sections were achieved by the two methods, which was 3.6~4.8 and 3.8~5.4, respectively. The results showed that by the dam reinforcing scheme, the deformation is decreased and the safety factor rises significantly.