In　order　to　determine　whether　the　groundwater　seepage　has　an　impact　on　the　ground　heat　exchanger　in　thermal　efficiency,　a　three-dimensional　coupling　thermal　seepage　model　of　the　vertical　u-tube　ground　heat　exchanger　was　established.　The　standard　κ-Ε　turbulence　model　was　used　inside　the　pipe　and　the　porous　media　model　was　used　outside　the　pipe.　The　heat　transfer　process　was　simulated　by　the　FLUENT　software　in　summer　cooling　condition.　By　the　simulation　results,　the　outlet　temperature　of　the　seepage　model　of　heat　exchanger　is　lower　than　the　no-seepage　model　of　heat　exchanger,　and　with　the　seepage　velocity　increasing,　the　heat　exchanger＇s　outlet　temperature　is　lower,　soil　temperature　field　around　the　heat　exchanger　offset　more　serious.　Therefore,　the　groundwater　seepage　of　ground　heat　exchanger　has　certain　influence　in　the　thermal　efficiency,　the　greater　the　seepage　velocity,　the　higher　the　efficiency　of　heat　exchanger.　What＇s　more,　the　seepage　direction　will　affect　the　distribution　of　the　soil　temperature　field　around　the　heat　exchanger.　©　2014　IEEE.