Effect　of　RRA　treatment　on　the　mechanical　properties　and　microstructure　of　Al-Zn-Mg-Cu-Er-Zr　aluminium　alloy　was　researched　by　hardness　measurement,　conductivity　measurement,　exfoliation　corrosion　measurement,　transmission　electron　microscopy　(TEM).　Discussed　the　relationship　between　the　regression　treatment　and　composite　properties　of　the　alloy.　The　study　found　that　the　hardness　of　RRA　treated　alloys　first　rise　and　then　decline　with　the　increasing　of　regression　time,　but　the　corrosion　performance　is　increasing　all　the　time.　After　pre-aging　treatment　120　degrees　C/24　h,　regression　treatment　180　degrees　C/60　min,　re-aging　treatment　120　degrees　C/24　h,　the　combination　property　of　the　alloy　is　optimal,　the　hardness,　conductivity　and　the　exfoliation　corrosion　grade　are　respectively:　207.6　HV,　33.53%　IACS,　PC.　At　this　moment,　it　is　found　from　the　TEM　observations　that　the　matrix　precipitates　are　small　and　dispersed,　resemble　to　T6　temper.　The　grain　boundary　precipitation　out　phases　are　discontinuous　distribution　and　the　relatively　wider　PFZ,　similar　to　the　T73　temper.