Taking Autodesk Revit series softwares as the research objects, real projects as a starting point, this arficle explores fast modeling method based on Revit, the meaning and 3D reconstruction. Based on the existing 3D modeling experience, combining the API technology, the author studys on develop function of 3D reconstruction from 2D graphics, exporting project information, and transforming model data based on Revit environment in Visual Studio 2008 software platform, and integrated many functions of assisted modeling.