Regarding　the　gear　in　2K-V　planetary　transmission　mechanism　as　the　research　object　and　based　on　the　theory　of　gear　meshing　and　the　heat　transfer,　the　changing　rule　of　the　relative　sliding　speed　and　contact　stress　of　tooth　surface　at　different　meshing　positions　is　analyzed.　The　boundary　conditions　of　steady-state　temperature　field　are　accurately　calculated,　including　the　friction　heat　flow　within　one　meshing　cycle　and　the　convection　heat　transfer　coefficient　of　different　tooth　surfaces.　A　single-tooth　model　is　established　and　ANSYS　Workbench　for　finite　element　analysis　of　temperature　field　is　imported　into.　By　dividing　the　meshing　surface　into　several　strip　areas　along　the　tooth　width,　the　friction　heat　flow　at　different　meshing　positions　can　be　loaded　and　the　steady-state　temperature　field　distribution　of　gear　is　obtained.　The　influence　of　the　number　of　strip　areas　on　the　temperature　field　is　analyzed.　The　results　show　that　the　temperature　field　tends　to　be　stable　when　the　number　of　strip　areas　is　more　than　50.　©　2022,　Editorial　Department　of　Journal　of　NUAA.　All　right　reserved.