Since the information contained in the three-dimensional model is very rich, involving many factors shape contour, texture, color, texture and other graphic images, as well as traditional as it will no longer rely on text-based entry staff image search technology text description. Therefore, the direct retrieval of the three-dimensional model is very complex, so this paper proposes a centroid as the origin of coordinates to strike inertial parameters of mechanical parts as the retrieval feature vector, to establish parameters for the index of the element of inertia characteristics of the table, enabling the retrieval development of the system.