Abstract: A method for analyzing a shape of a 3D model based on perceptive information comprises: decomposing the shape of the 3D model to generate decomposition results; and extracting a skeleton from the decomposition results. This invention can be applied to shape decomposition of objects having different shapes. The 3D models can be regular or with noise, containing either multiple annular structures or no annular structure. The decomposition method of this invention is not sensitive to noise, and the segmentation speed is high and accurate. The segmentation result of the invention can be widely applied to different branches of computer graphics and computer vision, such as computer animation, modeling, shape analysis, shape classification, object identification, etc. The skeleton extracted from the decomposition result and the following shape semantic description diagram can he applied to 3D model retrieval, model semantic analysis and so on.