In this paper

we present an approach based on similarity measuring between 2D polygon sets for 3D model retrieval. The basic idea is to represent the 3D model by a series of slices composed of 2D polygon sets along certain directions. In this way

the shape-matching problem between 3D models is transformed into the similarity measuring between 2D polygon sets

in which three problems are involved: the selection of cutting directions

cutting methods and similarity measuring. To solve these problems

some strategies and rules are proposed

and their are proved by some experiments.