Fe-20Ni-xMn-3.5C-2.5Si　solid　self-lubricating　materials　with　property　of　high-wearing　were　prepared　by　melting　method.　The　spheroidization　effect　of　rare　earth　Ce　on　graphite　and　the　effect　of　Mn　addition　on　mechanical　properties　and　tribological　performances　of　Fe-20Ni-xMn-3.5C-2.5Si　alloys　were　studied.　The　results　show　that　the　austenite　hardness　of　solidifying　structures　increases　as　the　manganese　content　increases.　The　surface　hardness　of　Fe-20Ni-xMn-3.5C-2.5Si-0.75Ce　alloy　increases　widely　after　being　worn　and　it　appears　the　work-hardening　of　surface　as　like　the　high　manganese-containing　steel.　The　type　of　compound　twin　martensite　on　surface　can　be　observed　by　TEM.　The　spheroidization　effect　of　0.75%　(in　mass　fraction)　of　rare　earth　cerium　on　the　graphite　during　crystallization　is　effective.　The　spheroidized　alloy　has　higher　tensile　strength　and　flexural　strength　which　is　about　3-5.8　times　higher　than　those　of　the　non-spheroidized　alloy.　With　the　addition　of　rare　earth　Ce,　the　second　phase　Fe1.1Mn3.9C2,　which　makes　the　wear　resisting　property　further　increase,　appears　in　matrix.　Fe-20Ni-12Mn-3.5C-2.5Si-0.75Ce　alloy　has　the　lowest　wear　rate　which　is　about　13　times　lower　than　that　of　the　spheroidal　cast　iron.