Effects　of　Er　and　Zr　addition　on　microstructure,　mechanical　properties　and　corrosion　properties　of　Al-Zn-Mg　alloy　were　studied.　The　results　show　that　the　composite　addition　of　Er　and　Zr　can　significantly　improve　the　hardness,　strength　and　corrosion　resistance　of　the　alloy.　With　the　addition　of　Er　and　Zr　elements,　nano-sized　Al3(Er,　Zr)　precipitates　are　dispersed　in　the　matrix,　which　can　hinder　dislocation　movement　and　grain　boundary　migration,　and　significantly　increase　the　strength　of　the　alloy.　In　addition,　the　addition　of　Er　element　refines　grain　of　the　alloy,　which　not　only　increases　the　strength,　but　also　guarantees　a　certain　elongation,　and　makes　the　alloy　also　have　good　anti　exfoliation　corrosion　performance.　©　2023　Chinese　Mechanical　Engineering　Society　of　Heat　Treatment.　All　rights　reserved.