Based on the chalcogenide glass IRG206 (As₄₀Se₆₀) substrates, we prepare the 8-12 μm anti-reflection protective films. This kind of film contains two parts: dielectric film and diamond-like carbon (DLC) protective film. It can be applied in the window lens of the non-thermalized infrared detection system. Moreover, the fracture mechanism of dielectric films is studied, and the deposition temperature of dielectric films is optimized to improve the adhesion of dielectric films. In addition, the effect of pressure on the microstructures and stress of DLC films is studied. By splitting the DLC film into the low-stress adhesive layer and the high-stress friction-resistant layer, the film stress is reduced, but the friction resistance as well as firmness of films are improved. The test results reveal that the average reflectivity of anti-reflection films at 8-12 μm is 3%. Furthermore, the anti-reflection films pass through the salt spray test, high and low temperature test, and severe abrasion test specified by GJB2485-1995, and possess good environmental adaptability.