As present, the recording layer of Write Once and Read Many (WORM) optical disk is usually made of organic dye. The optical absorption of the organic dye is lower than that of metal. The wavelength range that can be absorbed by the organic dye is narrow. It is not easy to get a uniformity organic dye layer in the high density optical disk due to its narrow groove. The organic dye also causes environmental pollution during the disk fabrication. In this study, Ag1-xSbx (x =10.8 to 25.5) thin films were prepared by RF magnetic sputtering. The thermal analysis shows that the phase change temperature of AgSb film is between 250 and 270 DEG C. The optical property analysis shows that all the as deposited films have good optical absorption and high reflectivity. The films also have good transmittance after annealed at 300 DEG C and 350 DEG C. The X-ray Diffraction analysis shows that the as deposited film is &egr; ' -AgSb crystalline phase. The films are still kept at &egr; '-AgSb phase after annealed at 300 DEG C and 350 DEG C for 5 minutes and 30 seconds. The TEM analysis shows that the grain size of the Ag 80.9 Sb 19.1 film will grow after annealed at 300 DEG C and 350 DEG C for 5 minutes and 30 seconds. The dynamic test shows that the carrier-to- noise ratio (CNR) of the Ag 80.9 Sb 19.1 optical disc is about 45 dB with &lgr; =657nm, NA=0.65 and a linear velocity of 3.5m/s.