Microalloying　has　been　an　important　method　in　aluminum　alloy　development　for　decades.　Large　number　of　papers　have　shown　that　the　addition　of　trace　element　Erbium　(Er)　can　effectively　improve　the　comprehensive　properties　of　aluminum　alloys.　Similar　with　the　trace　element　Scandium　(Sc),　addition　of　trace　element　Er　in　aluminum　alloys　could　form　nano-sized　L12-ordered　Al3Er　precipitates,　which　was　coherent　with　the　Al　matrix.　However,　the　dispersion　precipitation　strengthening　effect　of　Al3Er　was　more　significant　than　that　of　Al3Sc,　at　the　same　atomic　content.　In　the　case　of　the　addition　of　both　Er　and　Zr,　core-shell-structured　Al3(Er,　Zr)　precipitates　formed　instead　of　Al3Er　precipitates.　Those　thermally-stable　nanosized　precipitates　could　significantly　refine　the　grain　size,　retard　the　recrystallization,　improve　the　mechanical　properties　and　corrosion　resistance.　This　paper　reviewed　several　typical　Er-containing　microalloyed　commercial　aluminum　alloys,　like　2xxx　(Al-Cu)　alloys,　4xxx　(Al-Si)　alloys,　5xxx　(Al-Mg)　alloys,　7xxx　(Al-Zn-Mg-Cu)　alloys,　as　well　as　selective　laser　melting　aluminum　alloys.