Austenitic　manganese　steel　has　been　widely　used　in　various　fields　as　wear-resisting　material,　but　it　belongs　to　the　typical　difficult-to-machine　material　with　extremely　poor　cutting　performance,　which　limites　the　scope　of　its　application　to　a　large　extent.　The　composition　of　traditional　austenite　medium　manganese　steel　added　with　Mo,　Cr,　Nb　and　RE　to　combine　alloying　treatment　was　studied.　The　thermal　conductivity　and　machinability　of　prepared　manganese　alloy　in　the　austenite　was　tested.　The　effect　of　composite　alloying　on　machinability　of　austenitic　manganese　steel　was　explored.　A　second-level　fuzzy　comprehensive　evaluation　model　to　quantitatively　analyze　machinability　with　the　austenitic　manganese　steel　hardness,　tensile　strength,　elongation,　impact　toughness　and　thermal　conductivity　as　influencing　factors　was　established.　The　results　showed　that　the　composite　alloying　treatment　can　improve　machinability　of　austenitic　manganese　steel　to　a　certain　extent　when　contents　of　alloying　elements　Mo,　Cr,　Nb　were　1.87wt%,　2.43wt%　and　0.059wt%,　the　tool　flank　wear　width　(VB　value)　of　the　sample　reduced　by　14.3%　compared　to　the　non-alloyed　ZGMn13.　The　correlation　between　the　evaluation　index　obtained　by　the　two-level　fuzzy　comprehensive　evaluation　model　and　the　VB　value　obtained　by　the　tool　wear　experiment　was　significant.　The　linear　correlation　coefficient　was　-0.87334,　which　indicated　a　high　degree　of　linear　negative　correlation,　and　the　result　was　generally　consistent　with　the　VB　value.　In　this　way,　it　is　proved　that　the　evaluation　model　adopted　was　in　line　with　actual　production,　and　the　evaluation　result　was　accurate　and　effective.　©　2018,　Science　Press.　All　right　reserved.