Abstract: According to the characteristics of geometric shape and geology data of intrusive rock-mass, 3D modeling method is established. The section method is adopted to model intrusive rock-mass. 3D reconstruct of a set of planar contours is used to create the surface model of intrusive rock-mass. The problem of reconstruct of a set of planar contours is translated into the problem of structuring equivalent surface of body data. Visual modeling system based on the modeling technique is developed, being used to model the intrusive rock-mass in Lingbao mine.