Based on the original characteristics of discon tinuity in crustal stress field,considering the spatial shape of Jagged discontinuity and its velation with stress field,these formulasof shear motion direction,the anisotropic dilatancy(normal and widespread)and strength proportyof discontinuitv in three-dimensional stress field are derived under two different boundary conditionsof free and restraining displacement, and the widespread stress in crement under the displacementbeing restrained can be calculated.Pinally the anisotropic rules of discontinuity in three-dimensionalstress field are also confirmed by experimental data.