Lanthanum　citrate　was　synthesized　by　using　citric　acid　and　LaCl3　as　the　raw　materials.　The　experimental　results　showed　that　the　optimum　conditions　are　as　follows:　pH　is　4~5,　molar　ratio　of　raw　material　is　1.2∶1,　Temperature　is　50℃.　Then　add　to　SBR,　its　effect　on　curing　characteristics　and　mix　of　physical　and　mechanical　properties　of　vulcanized　rubber　were　studied.　The　results　show　that　the　t90　of　2.5%　of　lanthanum　citrate　mix　can　reach　943　s,　shortening　by　31　s　in　comparison　with　those　without　adding.　When　the　addition　amount　was　7.5%,　the　vulcanization　physical　and　mechanical　properties　of　rubber　could　achieve　the　best,　increasing　by　nearly　50%　than　those　without　adding.　Compared　to　the　same　time,　it　was　also　found　that　lanthanum　citrate　on　the　rubber　vulcanization　process　had　certain　anti-sulfide　reduction.　Therefore,　lanthanum　citrate　can　be　used　as　SBR　rubber　curing　agent　a　supplement.　©,　2015,　Chinese　Rare　Earth　Society.　All　right　reserved.