Abstract: In this paper, according to the problems of hard connection and management of the density of mesh nodes on both sides of FLAC^3D fault modeling by using interface method and weakening method, with the method of layered stratum modeling and intermediate program writing by using Java language, an approach to convert two-dimensional planar graph based on AutoCAD into FLAC^3D mesh model conveniently and efficiently was studied. The approach has basically achieved the visualization and automation of modeling process, improved the modeling efficiency and solved the problem of rapid modeling under complicated geological conditions.