Abstract: Threedimensional slope stability analysis with limit equilibrium method is developed, based on the assumption used in Bishop’s twodimensional simplified method. The sliding direction of whole slope is assumed. Thus this method can be applied to slope with rotational failure surface such as semispherical, ellipsoid, or composite failure surface that is the combination of the above rotational surface with plane.In this paper, some problem of applying this method to asymmetric slope is discussed.