Abstract: After being segmented by the methods of mesh segmentation for the surface mesh，the common boundaries of each sub-mesh which are the surface mesh’s closing feature lines.On the contrary，according to the geometry and topology characteristic of the mesh model，after extracting the closing feature lines of the mesh model that the surface meshes will be partition.Therefore，according to the surface mesh’s closing feature lines，a method of mesh segmentation is put forward in this paper.The experiments demonstrate the feasibility and validity of the method of segmentation proposed in this paper.