As　a　new　type　of　functional　composite　material,　magnetic　fluids　have　higher　thermal　conductivity　than　traditional　fluids,　and　arc　regarded　as　a　new　generation　of　heat　transfer　fluids,　which　have　attracted　extensive　attention　of　domestie　and　foreign　researchers.　However,　the　existing　theoretical　calculation　models　for　the　thermal　conductivity　of　magnetic　fluids　arc　not　universally　applicable,　and　cannot　accurately　prediet　the　thermal　conductivity　of　magnetic　fluids　at　different　temperaturcs.　Thcrc　are　differences　in　applicable　conditions　and　calculation　results　among　the　models.　Therefore,　in　Order　to　accurately　determine　the　thermal　conductivity　of　magnetic　fluids,　this　paper　designs　and　builds　an　experimental　System　for　mcasuring　the　thermal　conductivity　of　magnetic　fluids　based　on　the　transient　double　hot-wire　method,　with　the　average　measurement　error　less　than　1.55%,　studies　the　Variation　of　thermal　conductivity　of　commercial　aqueous　magnetic　fluids　with　temperature　under　the　action　of　different　magnetic　field　strengths,　and　quantitatively　analyses　the　applicable　temperature　ranges　of　different　theoretical　models.　The　applicable　temperature　ranges　of　different　theoretical　models　arc　quantitatively　analyzed.　The　results　show　that　the　thermal　conductivity　of　the　water-based　magnetic　fluid　(vol-ume　fraction　3.7%)　increases　approximately　linearly　with　the　increase　of　temperature　in　the　absence　of　a　magnetic　field.　When　the　temperature　increases　from　20　°C　to　70　°C,　the　thermal　conductivity　increases　by　47.12%.　Secondly,　a　significant　increase　in　the　thermal　conductivity　of　the　magnetic　fluid　oecurs　in　the　presence　of　a　magnetic　field.　At　20　°C　and　200　G,　the　maximum　increase　in　the　thermal　conductivity　of　the　magnetic　fluid　compared　to　the　absence　of　a　magnetic　field　is　81%.　Finally,　the　calculation　results　and　experimental　results　of　magnetic　fluid　thermal　conductivity　of　Maxwell　model,　Bruggcman　model,　Yu　&¦　Choi　model　and　Gianluca　Coccia　modcl　arc　compared　and　analyzed.　It　is　found　that　the　theoretical　model　calculation　aecuraey　is　higher　in　the　lower　temperature　ränge　(20　°C-35　°C),　which　is　consistent　with　the　experimental　results.　The　relative　error　of　the　results　is　within　5　%,　and　the　theoretical　model　can　be　directly　used　to　prediet　the　thermal　conductivity　of　the　magnetic　fluid.　When　the　temperature　increases　O　40°C),　the　deviation　between　the　theoretical　calculation　results　and　the　experimental　calculation　results　increases.　At　this　time,　the　theoretical　modcl　is　no　longcr　applicable,　and　the　aecurate　thermal　conductivity　of　the　magnetic　liquid　must　be　obtaincd　through　experimental　measurement.　©　2025　Journal　of　Functional　Materials.　All　rights　reserved.