The　interaction　of　precipitation　and　recrystallization　in　the　cold　rolled　Al-Er　and　Al-Er-Zr　alloys　was　investigated.　The　results　indicate　that　homogeneous　precipitation　of　Al3Er　starts　before　recrystallization　in　Al-Er　alloy.　Precipitation　formed　before　the　recrystallization　leads　to　precipitation　hardening　in　early　stage　of　annealing.　At　the　same　time　it　also　retards　recrystallization.　The　kinetics　of　homogeneous　precipitation　in　Al-Er-Zr　alloy　is　sluggish　compared　to　that　in　the　Al-Er　alloy,　but　the　formation　of　heterogeneous　nucleated　precipitation　on　subgrain　boundaries　and　dislocations　prevents　recrystallization.　The　effect　of　heterogeneous　precipitation　on　hardness　increase　is　not　greater　than　that　of　recovery/recrystallization　on　hardness　decrease　during　early　stage　of　annealing,　so　there＇s　no　significant　increase　in　hardness　for　cold-rolled　Al-Er-Zr　alloy.