Abstract: The technology of 3D measurement for volume data from industrial computed tomography (ICT) plays important role not only for the non-destructive testing and evaluation of equipments in aeronautics and astronautics area, but also for the reverse Engineering (RE). This paper takes the ICT volume data to research the 3D measurement methods of geometrical size, such as spatial distance, spatial angle, plane area, curved-surface’s area and object’s volume. In order to obtain the actual size of configuration in products, the measured results are transferred from image space into physical space. This work also compares the measured results by this method and the real size of evaluating model. It shows that the method has the acceptable precision.