It is difficult to build the three-dimensional model for intensive steeply-inclined thin vein by usingcontour modeling method. Starting from the complexity and particularity of its spatial distribution, a new three-dimensional modeling method was proposed, focused on thin vein orebody. Firstly, simplified the ore vein and extract high grade of main stable veins, then lengthened and deepened them as modeling object, secondly, three-dimensional surface model was constructed based on the technology of three-dimensional surface reconstruction, at the same time, the cross-section of the ore veins were used to constrain the orebody extending and deepening and to ensure the rationality of vein surface model. The theoretical analysis and experiment proves that the three-dimensional vein group model has better match condition to the actual situation, which can be used as the visualization tool for three-dimensional model and prediction of the deep orebodies.