In　this　paper,　the　influence　of　T6,　T74　and　RRA　aging　treatments　on　microstructure,　strength　and　corrosion　behaviour　of　high　Zn　content　Al-Zn-Mg-Cu　alloy　was　investigated　by　tensile　properties　tests,　inter-granular　corrosion　(IGC)　tests,　exfoliation　corrosion　(EXCO)　tests,　polarisation　tests,　metallographic　microscope　and　transmission　electron　microscopy　(TEM)　analysis.　The　results　show　that　the　T74　and　RRA　temper　can　increase　the　size　and　the　distribution　discontinuity　of　the　grain　boundaries　precipitates　(GBPs),　thus　leading　to　improvement　of　the　corrosion　resistance.　However,　with　the　coarser　matrix　precipitates　(MPs)　relative　to　T6　treatment,　RRA　and　T74　temper　both　have　a　decrease　in　strength.　Besides,　all　the　performances　(including　mechanical　properties　and　corrosion　properties)　of　the　RRA　treatment　show　an　intermediate　level　relative　to　T6　and　T74.　Therefore,　we　can　select　the　appropriate　heat　treatment　process　according　to　the　different　performance　requirements　in　the　industrial　production.