In order to prevent the damage of organic materials caused by strong ultraviolet radiation in space environment,the influence of chemical structure of organic materials on the stability of materials in ultraviolet environment was investigated through accelerated ultraviolet aging in laboratory environment,color difference analysis and gloss analysis were used to monitor the color change and gloss change of organic materials in the UV aging process,and a kind of organie material based on silicone resin with specific structure was selected,which would not fade,pulverize,mechanical properties decline after irradiation.The results showed that this material had high stability in extreme ultraviolet environment and was suitable for spacecraft marking in space environment.