The　effect　of　various　retrogression　and　re-aging　(RRA)　treatments　on　mechanical　properties　and　corrosion　behavior　of　a　new　type　Al-Zn-Mg-Cu-Er-Zr　alloy　was　investigated　by　microhardness　testing,　tensile　testing,　intergranular　corrosion　(IGC)　and　exfoliation　corrosion　(EXCO)　testing.　The　results　show　that　the　RRA　treatment　can　effectively　improve　the　IGC　and　EXCO　resistance　with　less　strength　sacrificing　because　the　grain　interior　precipitates　and　the　grain　boundary　precipitates　are　similar　to　that　of　T6　temper　and　T73　temper.　Meanwhile,　as　the　microhardness　of　the　retrogressed　alloy　reaches　the　peak　value　during　the　retrogression　at　170　degrees　C,　the　corresponding　RRA-treated　alloy　possesses　the　better　strength,　but　the　corrosion　resistance　is　poor　in　comparison　with　that　of　the　retrogression　at　190　degrees　C.　The　optimal　combination　of　strength,　IGC　and　EXCO　resistance　is　obtained　after　retrogression　at　180　degrees　C　for　60　min.　Moreover,　for　different　heat　treatment　tempers,　the　corresponding　microstructural　evolution　of　the　precipitates　including　Al-3(Er,　Zr)　particles　was　also　discussed　in　detail.