High-strength　aluminum　alloy　specimens　of　aluminum-magnesium-scandium-zirconium　system　were　prepared　by　adopting　the　additive　manufacturing　technologys　of　selective　laser　melting　(　SLM).　The　evolution　of　the　microstructure　and　mechanical　properties　of　the　specimens　during　annealing　and　solution　aging　treatment　were　studied.　In　addition,　high　and　low　temperature　cycle　experiments　were　carried　out　on　the　specimens　to　simulate　the　temperature　change　of　the　space　environment,　and　then　the　evolution　of　mechanical　properties　after　high　and　low　temperature　cycles　were　studied.　The　results　show　that　for　the　high-strength　aluminum　alloy　prepared　by　the　SLM,　the　annealing　treatment　can　significantly　improve　its　mechanical　properties.　After　the　high　and　low　temperature　cycle　experiment　simulating　the　space　environment,　mechanical　properties　of　the　specimens　remain　unchanged,　so　it　meets　the　performance　requirements　under　the　space　alternating　temperature.　©　2022　Chinese　Mechanical　Engineering　Society　of　Heat　Treatment.　All　rights　reserved.