In　order　to　study　the　electronic　structure　and　magnetic　properties　of　the　non-rare　earth　based　MnGa　binary　alloys　under　isostatic　pressure,　the　crystal　structure,　formation,　spin　electronic　structure　as　well　as　magnetic　property　of　the　tetragonal　MnGa　alloy　under　isostatic　pressure　of　500　MPa　were　systematically　studied　based　on　density　functional　theory　calculation　method.　The　results　show　that　the　tetragonal　MnGa　alloy　can　be　formed　easier,　however　the　compressibility　is　anisotropic　under　the　isostatic　pressure　of　500　MPa.　The　distances　between　heterogeneous　species　are　smaller　than　that　between　the　homogeneous　species.　The　band　structures　are　anisotropic　and　metallic.　The　Mn　d　states　form　higher　net　magnetic　moment　than　that　of　the　Ga　d　states　in　the　MnGa　alloy,　and　the　Mn　d　states　contribute　to　systematic　remanent　magnetism.　The　tetragonal　MnGa　alloy　presents　weak　ferrimagnetism,　its　net　magnetic　moment　decreases　under　500　MPa.　©　2024　Chinese　Ceramic　Society.　All　rights　reserved.