The　standard　sample　IRB7#　of　nano-sized　carbon　black　was　reated　by　different　methods,　including　washing　by　alcohol,　toluene,　water,　the　emulsion　of　toluene　and　water,　and　heating.　Surface　activity　of　the　obtained　nanoparticles　was　measured　using　inverse　gas　chromatography.　The　results　showed　that　the　dispersion　free　energy　could　be　significantly　increased　after　heating.　The　surface　activity　of　three　kinds　of　industrial　carbon　black　was　studied　after　heat　treatment　at　different　temperature.　The　results　indicated　that　surface　activity,　iodine　adsorption　number　and　nitrogen　surface　area　values　of　carbon　black　nanoparticles　increased　with　the　increase　of　temperature.　However,　the　dibutyl　phthalate　adsorption　value　maintained　nearly　constant.　The　performance　test　of　rubber　showed　that　with　the　increasing　heat　treatment　temperature　of　carbon　black,　300%　modulus　of　rubber　increased　before　450　degrees　C　and　decreased　after　450　degrees　C.