In　karst　regions,　groundwater　flows　through　complex　conduits　and　fractures,　resulting　in　substantial　variations　in　flow　velocity　and　temperature,　which　impact　the　efficiency　of　ground　heat　exchangers　(GHEs).　In　this　study,　numerous　model　experiments　were　carried　out　to　examine　the　temperature　distribution　of　the　stratum　surrounding　GHEs　under　karst　groundwater　seepage　conditions.　A　3D　numerical　model　and　experimental　platform　were　developed　to　simulate　the　interaction　between　seepage　and　GHE　thermal　dynamics　under　varying　seepage　velocity,　seepage　temperature　and　operating　modes.　Model　experiment　results　show　that　increasing　seepage　velocity　significantly　enhances　heat　transfer　efficiency　and　mitigates　thermal　accumulation.　The　influence　of　karst　groundwater　seepage　results　in　significantly　less　temperature　fluctuation　upstream　compared　to　downstream.　As　seepage　velocity　increases　from　3.59　x　10-6　m/s　to　1.08　x　10-5　m/s,　the　temperature　differential　between　upstream　and　downstream　regions　rises　by　73　%,　while　the　heat　transfer　efficiency　of　U-shaped　pipes　improves　by　36.7　%.　Variations　in　seepage　temperature　also　play　a　pivotal　role,　with　heat　exchange　efficiency　increasing　by　51.3　%　as　seepage　temperature　rises　from　58.2　degrees　C　to　94.3　degrees　C.　The　heat　exchange　capacity　of　GHEs　and　the　temperature　difference　between　downstream　and　upstream　increase　with　the　rising　temperature　of　karst　subsurface　water　seepage.　The　core　impact　of　seepage　temperature　lies　in　how　groundwater　seepage　initially　alters　the　temperature　field　of　the　strata　around　the　GHE,　ultimately　influencing　the　efficiency　of　heat　exchange　between　the　soil　and　the　buried　pipe.　This　research　provides　new　insights　for　optimizing　GHE　systems　and　ensuring　their　long-term　stability　and　energy　efficiency　in　karst　region.