The　effect　of　various　retrogression　and　reaging　(RRA)　treatments　on　the　strength　and　corrosion　behavior　of　a　new　type　of　Al-Zn-Mg-Er-Zr　alloy　has　been　investigated　by　hardness　testing,　tensile　testing,　and　evaluating　the　intergranular　corrosion　(IGC)　and　exfoliation　corrosion　(EXCO)　behavior.　The　results　show　that　the　RRA　treatment　can　effectively　improve　the　IGC　and　EXCO　resistance　by　sacrificing　less　strength　due　to　the　formation　of　grain　interior　precipitates　and　the　grain　boundary　precipitates　similar　to　the　T6　temper　and　T73　temper,　respectively.　At　the　peak　value　of　the　hardness,　the　alloy　retrogressed　at　190　degrees　C　shows　the　better　IGC　and　EXCO　resistance;　the　alloy　retrogressed　at　170　degrees　C　exhibits　the　higher　strength.　The　optimal　combination　of　strength,　IGC　and　EXCO　resistance　is　obtained　after　retrogression　at　180　degrees　C　for　60　min.　For　the　different　heat-treatment　tempers,　the　corresponding　microstructure　evolution　of　the　precipitates,　including　Al-3(Er,Zr)　particles　is　discussed　in　detail.