Introduced in the process of reverse engineering in surface modeling by Pro/Engineer software produced by PTC corp.,and the way to build satisfactory surface models composed of large 3D-points datum surveyed by CMM (Coordinate Measuring Machine).The emphasis is to build anomalistic curves and surfaces from numbers of datum.This paper especially probes into how to produce engineering 3D-curve directly from CMM datum file under Pro/Engineer environment.Through dealing with the datum of turbo gathered by CMM and building turbo surface,the method is proved to be feasible.