*.dwg格式ArcMap已支持,可以加载,请参考: Several CAD file formats can be directly accessed in ArcGIS. The supported CAD formats include: AutoCAD drawing files (.dwg) up to AutoCAD 2008 American Standard Code for Information Interchange (ASCII), binary, and partial drawing interchange files (.dxf) that comply with DXF standards up to AutoCAD 2008 MicroStation design files (.dgn) up to version 8