With the development of the space imaging, all of the countries have increased the research work about the preparation and application of the new optical material. Because of the good thermal stability, high specific stiffness, low density and being easy to light weight, the SiC material is becoming the preferred material for the main optical components of the space camera. The paper describes a new type of SiC optical material which is used in the optical system mirror. And the common preparation technologies and related applications of the SiC are introduced too. The SiC material’s preparations and processing technologies are summarized seriously. The author focused on the differences of the SiC material and conventional glass processing, and compared the processing situation home and abroad. From the current situation of the SiC processing, the technology of Computer-controlled Optical Surfacing (CCOS) has enhanced the efficiency and precision of the SiC greatly, which has broad application prospects.