Off-axis systems built by freeform optics are greatly demanded in next-generation space telescopes/cameras, for obtaining a long focal length and wide field of view. The profile accuracy of the mirror surface is the most critical parameter, which is finally required about 12 nm in peak-to-valley. Therefore, technologies for accurately and efficiently machining and testing freeform surfaces are greatly demanded. In this work, an ultrasonic-vibration-assisted five-axis grinding technology is developed and verified by grinding silicon carbide mirror blanks on a machine center having common precision. Subsequently, a computer-controlled optical surfacing technology is developed for lapping and polishing the mirror. A computer-generated hologram is developed for testing the mirror surface. This work provides an efficient resolution for the fabrication and measurement of freeform surfaces.