The　properties　and　microstructure　evolution　of　the　cold　rolled　Al-0.04Er　and　Al-0.08Zr　alloys　were　investigated　during　annealing　for　different　time.　The　results　indicate　that　the　influence　of　Er　element　on　electrical　conductivity　of　Al　matrix　is　less　than　that　of　Zr　element　with　the　same　concentration.　Moreover,　Er　element　can　precipitate　out　thoroughly　after　annealing　and　has　less　influence　on　the　conductivity,　so　the　electrical　conductivity　of　the　Al-Er　alloy　is　higher　than　that　of　the　Al-Zr　alloy.　For　the　Al-Zr　alloy,　the　electrical　conductivity　increases　with　the　precipitation　of　Zr　atoms,　but　the　hardness　decreases　due　to　recovery　and　recrystallization　of　the　cold　rolled　microstructure.　For　the　Al-Er　alloy,　both　electrical　conductivity　and　hardness　increase　with　the　increased　of　annealing　time　during　the　early　stage　of　the　annealing　treatment.　With　further　increase　of　the　annealing　time,　the　electrical　conductivity　increases,　while　the　hardness　decreases　due　to　the　coarsening　of　the　precipitates　and　the　succedent　recovery　and　recrystallization.　©　2018,　Editorial　Office　of　＂Jinshu　Rechuli＂.　All　right　reserved.