Effects　of　different　solution　and　aging　treatments　on　microstructure　and　mechanical　properties　of　Al-Cu-Mn-Er　alloy　were　studied　by　optical　microscope,　scanning　electron　microscope,　XRD,　DSC　test,　hardness　test　and　tensile　test.　The　results　show　that　the　optimal　process　of　solution　and　aging　treatments　of　the　as-cast　alloy　is　solution　treating　at　540℃　for　12　h　and　aging　at　185℃　for　6　h,　under　which　there　is　no　overheating　or　＂overburning＂　phenomena,　the　solute　atoms　are　fully　diffused,　and　a　large　amount　of　residual　phases　generated　during　the　casting　process　are　redissolved　into　the　matrix.　Meanwhile,　the　alloy　has　the　highest　hardness　value　of　142.28　HV0.1,　tensile　strength　of　370.37　MPa,　yield　strength　of　300.34　MPa,　and　elongation　of　6.50%.　©　2022,　Editorial　Office　of　＂Jinshu　Rechuli＂.　All　right　reserved.