Abstract：This paper describes organic protective coatings on space material for anti-AO effects and the experiments to assess the properties of the coatings. Organic protection waｓ analyzed after exposures to ground state fast atomic(AO) radiation in the atomic oxygen beam facility for ground simulation experiments. The tests results have been analyzed with advanced FTIR，XPS and SEM. The test indicated that epoxy，alkyd and urethane organic coatings were highly reactive to AO with a strong degradation and changed in morphology of the surface layer. It is evident that siloxane coatings have excellent properties for anti-AO effects. The erosion product haｓ SiO2 left on the surface, thus providing protection from further attack by the energetic oxygen atoms.
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