The key techniques for reverse engineering based on ct image are introduced . 3d reconstructed surface model does n ' t possess full geometry and topology information as solid geometry model . this dissertation presents an algorithm for rebuilding solid model from triangulated patch surface mod 介绍了基于ct图象反求的主要技术;针对重建三维表面模型不具备象实体几何模型的数据那样的完备信息的特点,提出一种基于ct图象的反求技术的实体几何造型方法,将重建模型转换为边界表示的实体模型,并将其作为本研究所开发的特征造型系统3dmodeler中的一种反求工程实体造型手段。