Natural landslides are generally of three-dimensional morphology with complex engineering geological conditions

environment and load effects.Three-dimensional（3D）visualization and numerical calculation can provide scientific basis for the mechanism analyses and stability evaluation.In this paper

a set of methods for 3D numerical analysis of slope is summarized.For the establishment of calculation model

the geological generator TGM of MIDAS/GTS can transfer contour map of terrain and strata of AutoCAD into 3D geometric visualization.A method of data conversion between MIDAS/GTS and FLAC

3D

is put forward on the basis of different identification form of grid data

thus 3D geological model can be established directly by Excel for large deformation calculation.For stability analysis methods

six analysis indexes

including displacement

stress

deviatoric stress

shear strain

plastic zone and safety factor are analyzed

and their rationality

general law

evaluation methods and some related suggestions are also summarized.Combined with a subgrade slope at S316 line of Xinjiang

its sliding mechanism and deformation characteristics are analyzed by the proposed technology and method.Thus

their feasibility and stability are proved.