Abstract: Sphere is one of the modeling languages frequently used in industrial design, but
because of some need or restrictions, a sphere is often approximately expressed as a polyhedron.
Some criterions of sphere's approximation with polyhedron and ways to improve the effects are
proposed, the applications of which in the industrial design are discussed as well. Finally, some
examples are presented.

Key words: industrial design, criterion of sphere's approximating, improving effect of
approximation, polyhedron