In order to obtain precise optical free-form convex mirror, we present a perfect process specification for fabricating and testing optical free-form convex mirror. Some technical requirements of 84×84 (mm) optical free-form convex silicon carbide (SiC) mirror are introduced. Firstly, the SiC blank is milled to the best-fitting sphere by means of DMG Ultrasonic 100-5 computer-controlled machine. Secondly, the best-fitting sphere is grinded and polished to optical free-form surface with certain figure accuracy by computer-controlled small tool fabrication. Finally, in order to meet the requirement of design, the optical free-form convex mirror is fabricated by advanced ion beam figuring. The contour testing technique is used for measuring the optical free-form convex mirror in milling and grinding processes, and the computer-generated hologram null testing technique for measuring the optical free-form convex mirror in polishing process is studied. The final testing result indicates that the figure accuracy of the optical free-form convex mirror is 0.02. (root mean square).