In order to investigate the effect of ionic liquid(IL) on the curing process and tribological properties of epoxy resin,epoxy resins refined with IL (1-butyl-3-methylimidazolium hexafluorophosphate) were prepared.The dispersion of IL in epoxy resins was investigated with the methods of FT-IR,H-NMR and SEM-EDS.The influence of IL content on the dynamic mechanical properties and tribological properties of the composites was discussed.The results demonstrate that there is no chemical reaction occurred between IL and epoxy resin or curing agent.Ionic liquids are evenly distributed in epoxy resin and from a homogeneous system with epoxy resin.Acting as plasticizers,IL has important impact on mechanical and tribological properties of epoxy resin.With the the increase of IL content,the hardness,bending strength and modulus of the composites increase first and then decrease.The friction coefficient of the epoxy resin is significantly reduced by the addition of IL,but the anti-wear performance decreases slightly.Composites with mass fraction of 10% IL display better properties of friction reduction and wear resistance.