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This paper is mainly solving the problem of disperse ore bodies rebuilt and how to make up the differences in the rebuilding course between the ore bodies formed and the actual ones based on the borehole data. According to the thought of isosurface reconstruction, it uses the method of irregular pentahedron volume rendering and in accord with the free combination interpolation to solve disperse ore bodies rebuilt and then uses the mouse to mend the outline of the ore body if the rebuilt is not satisfied at some space. This method makes up the disfigurement of common body-modeling, which can be used for the one ore body built or more disperse ore bodies built. The experiment shows this method effective and the result is more truly. So it can be extended to rebuild various bodies underground meanwhile.