A combined environment of atomic oxygen and ultraviolet （AO/UV） has been successfully simulated to in-situ characterize spacecraft materials and to develop effective protection technologies. The simulation facility mainly consists of a microwave electron resonance ion source, driven by 1 kW at 2.45 GHz, and two deuterium UV lamps. The 5 eV atomic oxygen beam flux is estimated to be 3×10^15 AO/cm^2·s., and the wavelength of the UV irradiation ranges from 115 nm to 400 nm. Possible damages, caused by AO/UV environment, of some typical spacecraft materials, including thermal control paint, TO/kapton and Ge/kapton films, were simulated, and protective coating of Al2O3 was developed.
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