A　novel　Al-Mg-Si　aluminum　alloy　with　the　addition　of　the　micro-alloying　element　Er　and　Zr　that　was　promptly　quenched　after　extrusion　has　been　studied.　The　solid　solution　and　aging　treatment　of　the　novel　alloy　are　studied　by　observing　the　microstructure,　mechanical　properties,　and　strengthening　mechanism.　Scanning　electron　microscopy　(SEM)　and　transmission　electron　microscopy　(TEM)　techniques　are　employed　to　examine　the　changes　in　the　microstructure　resulting　from　various　solid　solution　treatments　and　aging　treatments.　The　best　strengthening　effect　can　be　achieved　when　the　solubility　of　the　MgSi　phase　and　precipitate　β″　(Mg2Si　phase)　is　at　their　maximum.　The　addition　of　Er　and　Zr　elements　promotes　the　precipitation　of　the　β″　phase　and　makes　the　b″　phase　more　finely　dispersed.　The　aging　strengthening　of　alloys　is　a　comprehensive　effect　of　the　dislocation　cutting　mechanism　and　bypass　mechanism,　the　joint　effect　of　diffusion　strengthening　of　Al3(Er,Zr)　particles　and　the　addition　of　Er　and　Zr　elements　promoting　the　precipitation　strengthening　of　β″　phases.　In　this　paper,　by　adding　Er　and　Zr　elements　and　exploring　the　optimal　heat　treatment　system,　the　yield　strength　of　the　alloy　reaches　437　MPa　and　the　tensile　strength　reaches　453　MPa　after　solid　solution　treatment　at　565　°C/30　min　and　aging　at　175　°C/10　h.　©　2023　by　the　authors.