The　work　aims　to　improve　the　mechanical　properties　of　M2052MnCu　alloy　formed　by　selective　laser　melting　(SLM).　M2052　MnCu　alloy　was　formed　by　SLM　and　the　microstructure　was　controlled　by　heat　treatment　methods　such　as　solution,　aging,　solution+aging,　etc.　The　microstructure,　grain　morphology,　tensile　fracture　morphology　and　phase　composition　of　the　alloy　were　analyzed　by　scanning　electron　microscopy　and　X-ray　diffractometry.　The　yield　strength,　tensile　strength,　elongation　and　impact　toughness　after　SLM　forming　and　heat　treatment　were　evaluated　by　tensile　and　impact　property　tests.　The　SLM-formed　M2052　alloy　presented　a　typical　eutectic　structure　after　solution　treatment;　the　structure　after　aging　treatment　was　similar　to　the　morphology　formed　by　SLM,　showing　a　fine　sub-twisted　structure;　and　the　eutectic　structure　after　solution+aging　treatment　was　coarse.　The　microstructures　of　the　four　states　were　composed　of　single-phase　γ　solid　solution.　The　α-Mn　phase　precipitated　in　the　aging　state　and　the　solution+aging　state,　but　the　precipitated　content　was　more.　The　SLM　formed　morphology　had　a　high　tensile　strength　σb　and　a　yield　strength　σp0.2　(636　MPa　and　548　MPa).　The　aging　treatment　could　improve　the　σb　and　σp0.2　(707　MPa　and　570　MPa)　of　the　alloy,　but　the　impact　toughness　and　elongation　(5.5　J　and　8.5%)　was　poor;　and　solution　treatment　could　significantly　improve　the　impact　toughness　and　elongation　of　the　alloy　(23.5　J　and　22.25%).　Through　comprehensive　comparison,　solution+aging　samples　had　the　best　mechanical　properties　(the　impact　toughness　of　17　J,　the　elongation　of　10.8%,　σb　of　503　MPa,　and　σp0.2　of　322.5　MPa).　Fracture　analysis　showed　that　the　four　states　had　ductile　fractures.　Solution+　aging　heat　treatment　can　precipitate　a　small　amount　of　α-Mn　phase　in　the　presence　of　single-phase　γ　solid　solution,　thus　comprehensively　improving　the　mechanical　properties　of　manganese-copper　alloy.　©　2019,　Chongqing　Wujiu　Periodicals　Press.　All　rights　reserved.