Compatibility and properties of EPDM/BR blends with or without AAHR(a mixture of aliphatic and aromatic hydrocarbon resins) as a compatibilizer were investigated. the melt viscosity, elastic modulus, and tan δwere increased with increasing EPDM contents. The dynamic mechanical analysis and the morphoogical studies revealed that EPDM and BR were incompatible and the addition of AAHR was very effective to enhance the compatibility between EPDM and BR. The weight percent of bound rubbers was increased with increasing BR contents. It was found that the addition of a AAHR in creased the amounts of bound rubbers and hence the vulcanizate properties such as tear strength and fatigue resistance of the EPDM/BR blends were improved. The blends of maleic anhydride-grafted EPDM and BR were also prepared and the properties were compared.