In　order　to　study　on　the　effect　of　temperature　on　composite　fouling　characteristics　of　nanometer　magnesia　and　calcium　carbonate,　the　influence　of　temperature　on　composite　fouling　characteristics　in　the　alternating　elliptical　axis　tube　has　been　experimentally　studied　by　changing　the　entrance　temperature,　and　the　effect　of　temperature　on　the　working　fluid　coagulation　was　studied　by　sedimetation　experiment.　The　results　showed　that,　the　entrance　temperature　significantly　affect　the　composite　fouling　characteristics.　The　asymptotic　value　of　fouling　resistance　decreased　and　the　time　of　reaching　the　asymptotic　value　shorter　with　the　higher　entrance　temperature.　Effect　of　temperature　has　the　opposite　law　between　the　nano-particles　fouling　and　the　CaCO3　crystallization　fouling.　Increased　temperature　resulted　in　the　decrement　of　nano-particles　fouling　resistance　much　higher　than　the　increment　of　crystallization　fouling　resistance.　©　2015,　Science　Press.　All　right　reserved.