Abstract：Making the best of data management and spatial analysis of GIS，this paper puts forward a method for 3D stability calculation of slope based on the principle of minimum potential energy；of which the adaptation to systematic analysis of sliding surface and mass，assumptions in traditional methods are avoided in this one. Geometric and mechanical parameters，which can be easily acquired from 3D geoscience model，are absolutely necessary for stability index calculation of slope with various shapes. Its rationality and fitness are proved by comparison of 2D and 3D calculation results.
