A series of 65GeS2-15Ga2S3-(20-x)CsCl-xCsI(x=0, 5, 10, 15, 20) chalcogenide glasses were prepared by the traditional melt-quenching method. By means of the measurement of the density, micro-hardness, Visible-Near Infrared absorption spectra, Infrared optical transmission spectra, Raman spectra, X-ray diffraction curves and glass transition temperature Tg, the optical characters of this kind of glasses were studied systematically. The results show that, the series of glass samples have a wide composition range of glass formation and a good transparency in the entire 0.42～12 μm spectral region . With increasing of the content of the CsI, the density increases progressively. With increasing of the content of the CsCl, the optical band gap and microhardness increase gradually. Tg of glass samples changes with the change of the molar ratio of Cl－/I－. When the ratio located at 1, Tg hits its rock bottom.