In order to explore the change law of friction properties of fluorine rubber(FKM)under high temperature and oil-deficient environment and improve its friction properties,alumina(Al2O3)was added into FKM,and FKM/Al2O3 composites were prepared by mechanical blending method.The tribological properties of the FKM/Al2O3 composites and FKM under different loads were compared and analyzed under the oil-deficient environment at normal temperature and 200 ℃ high temperature.The results show that the addition of Al2O3 particles improves the matrix hardness of FKM at normal temperature and high temperature,therefore the friction coefficient,roughness and wear scar depth of FKM/Al2O3 composites were reduced under the same conditions compared with FKM.Al2O3 as reinforcing material improves the friction performance of FKM matrix in high temperature and oil-deficient environment,and the delamination phenomenon of composite surface is obviously reduced.The results of surface element analysis of the composites show that a solid lubricating film is formed by Al2O3 particles on the FKM surface,which improves the friction performance of FKM in the environment of high temperature and oil-deficient.