Abstract: A novel atomic oxygen simulator is introduced. The simulator uses an advanced electron cyclotron resonance technology. Under optimum condition.10￣15/ (cm2. s) beam density can be obtained. Two kinds of material which have been often used in spacecraft, kapton and graphite/epoxy, were tested in this simulator and it is the first time that we successful in obtaining the results of atomic oxygen beam effects in China. The surface morphology analysis shows that our results are similar to those of NASA and ESA. It is evident that China has made important progress in ground simulation of atomic oxygen effects.