We developped the rotary three-targets magnetron sputtering technology together with the New Energy Center of Peking University and used it to produce TYY-MC series(Double M-ALN cermet coatings) tube which has the advantages of highest thermal efficiency(0.96)¡¢ lowest emittance rate(¡Ü0.04/20℃) and working effectively in the high temperature(300-350℃) in contrast to the normal evacuated tube.