Effect　of　solution　treatment　on　the　properties　and　microstructural　evolution　of　Al-Zn-Mg-Cu-Er-Zr　alloy　was　investigated　by　hardness　test,　conductivity　test,　exfoliation　corrosion　test,　scanning　electron　microscope　(SEM),　transmission　electron　microscopy　(TEM).　The　results　show　that　the　hardness　of　single-stage　solution　treated　samples　first　increase　and　then　decrease,　the　conductivity　and　volume　fraction　of　the　residual　phase　particles　decrease　with　increasing　solution　temperature.　Compared　to　conventional　multi-stage　solution,　slow　heating　process　solution　treatment　can　dissolve　plenty　of　residual　phases　and　further　improve　the　hardness　and　decrease　conductivity.　Besides,　the　effect　of　solution　treatment　on　EXCO　is　discussed,　the　result　of　exfoliation　corrosion　of　SHT8　sample　test　is　judged　as　EA.　Moreover,　the　effect　of　the　presence　of　nanometer-sized　Al3(ErZr)　particles　on　the　microstructural　evolution　during　solution　treatment　has　also　been　discussed　in　detailed.　©　2017　Trans　Tech　Publications,　Switzerland.