The　effect　of　nitrogen,　carbon　and　manganese　on　mechanical　properties　and　work-hardening　ability　metastable　austenitic　manganese　steel　was　studied.　The　results　indicated,　in　impact　working　condition,　because　of　effects　of　stress　wave,　the　wear　resistance　can　be　improved　greatly　when　the　work-hardening　capacity　and　mechanical　properties　are　increased　together　significantly.　For　1.5C-12.7Mn　austenitic　manganese　steel,　when　the　carbon　content　is　decreased　to　about　1%,　the　manganese　content　and　nitrogen　content　are　≤0.8%　and　≈0.1%　respectively,　a　new　wear-resistant　steel　(nitrogen　microalloyed　metastable　austenitic　Mn　steel)　can　be　obtained.