Since the difference between accuracy of modeling software, the conversions from surface to solid often fail in model reconstruction. Therefore, the replacement of the solid modeling by grid model can simplify process of surface models and obtain high efficiency in some applications. So high-quality triangular grid model is crucial in the reconstruction. However, the shape of the current grid model of points is not well controlled and lacks detailed characterization. Therefore a normal vector filter criteria on the basis of body algorithm is present in this paper. The experiment proves that improved algorithm greatly enhances the precision of space point cloud mesh. That method guarantees that final triangular mesh has the same topology as the prototype, which can be well used for laser remanufacture to guide the robot processing.