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This paper used the STEP AP203 files as the input information, an 3D reconstruction module was developed on the basis of Open CASCADE 3D modeling platform by using the Visual C++. The data structure of STEP neutral file was analyzed and the correspondent C++ class of its geometry and topology information was designed. By using the STEP-Based attributed adjacency graph matching technique, features in the STEP model would be recognized. The DNAFRS system with the 3D reconstruction module and feature recognition module was developed.