The　influence　of　different　contents　of　Cr,　Mo,　and　rare　earth　element　(RE)　additives　on　the　thermal　conductivity　of　austenitic　medium　manganese　steel　was　studied　and　discussed.　The　results　show　that　the　addition　of　Cr　in　medium　manganese　steel　can　improved　the　ordering　of　C-Mn　atomic　clusters,　so　as　to　improve　the　steel＇s　thermal　conductivity.　However,　Cr　will　lead　to　precipitation　of　a　great　deal　of　carbides　in　medium　manganese　steel　when　its　content　is　greater　than　4wt%.　These　carbides　would　aggregate　around　the　grain　boundary,　and　as　a　result,　the　thermal　conductivity　is　decreased.　By　the　addition　of　Mo　whose　content　is　about　2wt%,　spherical　carbides　will　be　formed,　thus　improving　the　thermal　conductivity　of　the　medium　manganese　steel.　The　interaction　between　rare　earth　elements　and　alloying　elements　will　raise　both　the　thermal　conductivity　and　the　wear-resisting　property　of　medium　manganese　steel.