Ceramic laser gain media not only has excellent physical and optical properties but also has high resistance to fracture,potential damage resistance and machinability over single crystals.It is certain that ceramic gain media will replace single crystals in the future many applications.A ceramic laser is a real revolution in solid state lasers.Developments and advantages of ceramic gain media are reviewed.The systematic study of ceramic gain media properties which has been conducted by U.S.AFRL and ARL is introduced.Finally,two high-power ceramic lasers with excellent beam quality and the key technologies which are being developed by America are reviewed and analyzed.