Chalcogenide glasses having IR (8~12${mu}{ extrm}{m}$) transmittance were prepared and their densities, thermal and mechanical properties, IR-transmittances and chemical durabilities were determined. Glass transition temperatures (Tg) of Ge-As-Se, Ge-As-Se-Te and Ge-SE-Te system glasses were in the range of 280~3$65^{circ}C$, 210~236$^{circ}C$ and 210~26$0^{circ}C$, respectively. Crystallization temperature (Tc) of Ge-Se-Te system glass was in the range of 305~40$0^{circ}C$. Their thermal expansion coefficients($alpha$) were in the range of 11.7~15.2$ imes$10-6/K, 15.4~16.0$ imes$10-6/K and 17.4~27.8$ imes$10-6/K, respectively. Their MOR, hardness and fracture toughness were in the range of 15.2~18.6MPa, 36.1~58.2Kg/$ extrm{mm}^2$, 1.0~1.3 MPa.mm1/2, 18.9~24.9 MPa, 40.9~65.1Kg/$ extrm{mm}^2$, 1.3~1.5 MPa.mm1/2, and 24.1~30.8 MPa, 40.9~86.0Kg/$ extrm{mm}^2$, 1.4~1.8 MPa.mm1/2, respectively. IR transmittance of Ge-Se-Te system glass was about 60%. Ge-O extrinsic absorption peaks at 8, 12 ${mu}{ extrm}{m}$ were significantly eliminated by the addition of Mg. Chemical durabilities in deionizied water of Ge-Se-Te system glass were good and IR-transmittances decreased with leaching time and temperature.