Most　of　multi-component　high　entropy　alloys　(HEAs)　are　only　based　on　metal　elements　and　rarely　added　with　nonmetallic　elements.　In　present　paper,　CoCrFeNiMn　HEA　added　with　0.1　at.%　N　has　been　successfully　synthesized　by　mechanical　alloying　(MA)　followed　by　vacuum　hot　pressing　sintering　(VHPS).　During　the　MA　process,　the　alloying　elements　were　gradually　alloyed　and　formed　as　face-center　(FCC)　solid　solutions.　Subsequently,　σ　phases,　Cr2N　phases,　FCC　matrix　phases　with　traces　of　Cr23C6　carbides　were　observed　after　VHPS.　In　comparison　with　CoCrFeNiMn　HEA　produced　by　the　same　method,　the　Vickers　hardness　increased　up　to　468HV,　while　the　yield　stress,　ultimate　compressive　strength　increased　by　203　MPa　and　115　MPa　respectively,　accompanied　by　a　small　decrease　in　plasticity.　This　demonstrates　that　adding　N　element　is　a　viable　approach　for　properties　enhancement　of　HEAs.　©　2017　Elsevier　Ltd