A series of Ge-Te-Ag chalcogenide glasses were prepared by traditional melt-quenching method and the glass-forming region was determined.Archimides principle,X-ray diffraction(XRD),differential scanning calorimetry(DSC),ultra violet-visible-near infrared(UV-VIS-NIR) absorbtion spectrum,Fourier transform infrared spectrum(FTIR) were adopted to analyze physical,thermal and optical properties of sample glasses.The results show that the density of glasses increases with the increase of Ag.The glass forming ability and the thermostablity of the glasses are improved when Ag is doped in.In addition,a red-shift occurs at the short-wavelength absorbtion cutoff edge while the infrared cutoff wavelength is nearly unchanged with the increasing of Ag.The wide infrared transmission of this glass system reveals that it may have great potential application in far-infrared material fields.