Abstract: A three-dimensional prismoid was formed by connecting adjacent sections of ore body into a three-dimensional visualization model of deposits to show the ore body shape. An algorithm for matching adjacent sections of an ore body was studied. Polygonal sections were first matched to address the question of which piece to fit where. Secondly, the characteristic vertices of the polygons were given an approximate match up. Finally, the original polygons were cut into several parts by these characteristic vertices. A matching relationship between upper and lower sections was determined and the surface model of the ore bodies was formed through triangulation. Actual mining practice verified that this algorithm is fast and accurate in matching complex ore bodies, and is unaffected by size, rotation, and transformation of the polygon.