Abstract: A nonlinear finite element method is presented for stability analysis of gravity dam against deep sliding in consideration of the effect of lateral shearing resistance of rock mass. The method is based on the principle of quasi-planar problems and simulates the effect of lateral shearing resistance of rock mass by using nonlinear spring elements. The computer program ZMF-2 was complied accordingly and examined by a model test and an example. It is shown that the method is feasible.