1.Beijing Spacecrafts，Beijing 100190;2.China Aerospace Components Engineering Center，Beijing 100094
In order to investigate the effect of deep space irradiation enviroment on solar spectral absorption performance of SCB-1 high absorptivity stray light coatings，the series irradiation tests of SCB-1 stray light coatings were carried out with 5 000 ESH vacuum-UV irradiation， 2.5×1015 p/cm2 vacuum-proton irradiation and 2.5×1016 e/cm2 vacuum-electron irradiation. The changes of appearance， solar absorption and hemispheric emissivity of stray light coatings before and after various deep space irradiation tests were analyzed. Thermal gravity analysis was used the determine the decomposition and thermal stability of the coatings after the deep space irradiation test. After the series irradiation test， the total change value of solar absorption of SCB-1 stray light coatings in the full-wave band decreased by 0.011 to 0.012， and the total change value of solar absorption of SCB-1 stray light coatings in the 400 to 1 100 nm band decreased by 0.011 to 0.013.During the above three series irradiation process， the total change value of hemispherical emissivity of SCB-1 stray light coatings have no obvious change. SCB-1 stray light coatings show the excellent extinction durability under deep space irradiation environment， which provide the strong support for future development of optical technology in deep space exploration field.