In representing automobile parts with mesh in the field of reverse engineering or finite element generation,the mesh reconstruction and data exchanging between different CAD/CAM systems often introduce many invisible topological and geometrical errors into mesh.These artifacts can cause serious problems in subsequent operations such as finite element analysis,reverse engineering,animation,and simulation.In this study we propose a practical method for repairing topological and geometrical errors on mesh.First,coincident vertices during mesh input are removed,followed by the identification of non-manifold vertices and edges.The non-manifold vertices are modified,and the facets having non-manifold edges are removed.Finally,faces that have the wrong orientations in the mesh are re-oriented.Experiments show that our methods can eliminate most common mesh errors quickly and effectively.The refined mesh can be properly used in subsequent operations.