Abstract：The contact surface between landslide body and rock foundation is simulated by rectangle element for plane problems or cubic element for three dimensional problems with small thickness. A nonlinear iterative computation method is suggested to meet Mohr-Coulomb criterion for the stresses on the surface of sliding. On the basis of the nonlinear iterative method， a finite element iteration method of safety factor against sliding of the landslide body is presented to meet the limit equlibrium condition. This method can be used for 2D and 3D problems and the results include displacement field and the stress field. An example of the safety factor against a broken-line slide plane is analyzed. It demonstrates that the method suggested in this paper is effective，rational and reliable.
