In the paper,AR coating is introduced and T is above 98% at 7.8～10. 6μm wavelength. In order to resolve physical durability, several advantage techniques are being imp roved, such as choosing of materials, reasonable film design , ionaid deposition parameter adjustment and feasible temperature. Finally,AR coating on ZnSe Substrate with super machines stability and high transmittance efficiency is advanced, which can pass environment test of GJB2485 - 95.