The　dynamic　thermal　characteristic　of　the　windings　is　very　important　for　the　application,　protection　and　control　of　motor.　Based　on　the　equivalent　thermal　circuit　of　the　induction　motor　stator,　the　dynamic　temperature　model　of　the　stator　winding　was　established　in　this　paper.　Then　the　parameters　of　the　dynamic　thermal　characteristic　were　determined　by　the　method　of　curve　fitting　based　on　the　measured　temperature　data.　The　discrete　algorithm　of　windings　dynamic　thermal　characteristic　which　can　be　used　to　calculate　the　windings　temperature　under　variable　load　was　also　studied　in　this　paper.　Experimental　results　show　that　the　discrete　algorithm　can　accurately　calculate　the　maximum　temperature　of　the　windings　in　a　variety　of　operating　conditions.　The　error　will　not　be　accumulated　with　time,　and　the　initial　error　will　be　gradually　reduced.　It　lays　the　foundation　for　high-efficiency　application,　high-accuracy　protection　and　high-precision　control　of　the　motor.　©　2013　Chin.　Soc.　for　Elec.　Eng.