To study the dynamic sealing properties of aluminum(Al)impregnated graphite composite at high temperature condition, a ringblock wear testing machine was used to investigate the oxidation resistance of Alimpregnated graphite material at high temperature and the dry slide wear behavior at room temperature. The morphologies and composition of oxidized/worn surfaces were characterized with optical microscope(OM), scanning electron microscope(SEM) and Xray Diffraction(XRD). The oxidation and wear mechanism of Alimpregnated graphite were discussed. The results show that comparing with graphite, Alimpregnated graphite composites have better oxidation resistance at the same temperature and duration from 300 ℃to 500 ℃.The strength and loading capacity of the composite substrate are improved due to the impregnation of Al into the graphite, and a frictional layer is formed on the surface by graphite during friction process, therefore the wear resistance of Alimpregnated graphite composites is improved significantly..