Abstract: SiCrO_xN_y selective absorbing coatings are deposited on copper substrate by DC and IF sputtering.The absorption rate of the coatings reaches 0.938 and the emissivity is 0.07 at 80 ℃.After heat treatment at 300℃ for 200 h,the absorptivity do not change significantly,but the emissivity increases slightly.AES analysis shows that the main reason for the decrease of optical properties is the diffusion of elements at the interface and the oxidation of Cu substrate.The 5% salt spray corrosion test was carried out at 35 ℃.At the beginning of corrosion,the emissivity of the coating increases rapidly,the absorption rate decrease after 36 h corrosion,and the surface of the coating begin to peel off.The dense SiO₂ anti-reflective coating plays an important role in enhancing the weather resistance of the SiCrO_xN_y coating.