By　using　the　conjugated　heat　transfer　computational　method,　heat　transfer　characteristics　in　the　straight　through　the　labyrinth　seal　used　in　a　typical　gas　turbine　were　numerically　investigated　and　the　predictions　were　compared　with　the　experimental　data.　At　two　different　sealing　clearances,　the　Nu　distributions　on　the　rotor　and　stator　surfaces　were　computed　for　the　smooth　labyrinth　seal　with　13　fins.　The　calculated　Nu　distributions　agree　well　with　the　experimental　data　in　a　range　of　Re　numbers.　The　results　show　that　the　turbulence　model　has　a　significant　effect　on　the　heat　transfer　computations.　Among　the　selected　eddy　viscosity　turbulence　models,　the　k-ω　and　SST　models　show　superior　accuracy　to　the　k-ε　and　k-ε　RNG　models　which　over-predict　Nu　by　about　70%.　On　the　labyrinth　seal　stator,　Nu　increases　in　the　axial　direction　before　the　first　clearance　while　it　fluctuates　with　a　certain　value　after　the　first　clearance.　On　the　rotor　surface,　Nu　increases　in　the　axial　direction　in　the　chamber　region　and　jumps　sharply　in　the　clearance　region.　The　temperature　gradients　in　the　solid　domains　of　the　stator　and　rotor　increase　with　an　increase　in　Re,　but　the　distribution　profiles　of　Nu　in　the　axial　direction　are　nearly　similar　for　each　Re.