Abstract: Functional model for realizing the data integration of 3D measuring machine，reverse engineering software，and CAD/CAM system is proposed to shorten the time to market of new product．M easured data from CM M （Coordinate M easuring M achine） ，describing the geometric feature of contour lines of a part would be sent directly to RE software．After refining and smoothing the point set，meshes of curves would be generated and sent to CAD/CAM system．The original data clouds would be overlaid onto the NURBS model obtained from CAD system to veri-fy the accuracy of rebuilt surfaces．The CAD model may be further modified，analyzed or NC machined at will within the context of current CAD/CAM system．Feasibility of such an approach has been testified on a sample part．