本文介绍了一个实用化的工程图纸处理系统─—ＥＤＤ／ＡｕｔｏＣＡＤ，该系统可以将扫描后的光栅图纸装入到ＡｕｔｏＣＡＤ编辑环境中，直接对光栅图进行编辑修改，或利用矢量化工具将其转成矢量图形。本文就系统涉及的光栅矢量混合编辑技术、矢量化技术等关键技术提出了新的解决办法，并进行了讨论。 This paper introduces a practical engineering paper processing system - EDD / AutoCAD, the system can be scanned raster drawings into the AutoCAD editing environment, directly to the raster image to edit or modify, or use the vectorization tool to turn it Into vector graphics. In this paper, new solutions to the key technologies of raster vector mixed editing and vectorization are put forward and discussed.