Supercritical　Water　Reactors　(SCWRs)　are　essentially　water　reactors　operating　at　pressure　and　temperature　above　critical　point.　The　heat　transfer　coefficient　is　relative　low　when　the　bulk　temperature　is　above　the　pseudo-critical　point　due　to　the　properties　of　vapor-like　fluid.　To　obtain　better　heat　transfer　characteristics,　increasing　the　fluctuation　using　obstacles　is　the　conventional　method.　Heat　transfer　characteristic　in　vertical　tube　with　different　obstacles　is　numerically　investigated　under　supercritical　condition.　Numerical　simulation　is　carried　out　with　commercial　CFD　code　Fluent　6.1　and　adaptive　grid.　The　results　show　that　The　RNG　k-epsilon　model　with　enhanced　wall　treatment　can　obtain　a　reliable　result;　the　blockage　ratio　and　the　local　temperature　have　large　influence　on　the　heat　transfer　enhancement.　The　influence　region　and　decay　trend　of　obstacles　are　also　studied　and　compared　with　existing　correlations.