In order to obtain high quality far-infrared chalcogenide glasses, traditional melt-quenching method jointing with dynamic glass water removing under high temperature and raw material solidifying under vacuum evacuating process have been adopt to prepare Te chalcogenide glasses with high halogen content (halogen Imax= 40 at.%), and analyzing a series of Ge20Te80-xIx (x=10,15,20,25,30,35,40) chalcogenide glass samples. Vis-NIR absorption spectra and infrared optical transmission spectra will be acquired through using spectrophotometer and Fourier transform infrared spectroscopy instruments. Internal microstructure of the glasses is analyzed by using Raman spectroscopy and X-ray diffraction instruments. The research shows that with the increase of the halogen elements I, blue shift will occur in the visible / near-infrared absorption spectrum of short-cut edge, the optical band gap will increase gradually, and the glasses remain pervious to light from 1 μm near-infrared to 25 μm far-infrared wavelength. In addition, it is found that Ge20Te65I15 glass sample has the largest glass transition temperature near 138℃ centigrade, and the infrared transmission rate is also the highest among these glasses, up to nearly 50%.