In　the　last　decades,　the　usage　of　rare　earth,　especially　La,　Ce,　Nd,　Y,　Sc　and　mischmetall　in　aluminum　alloys　has　been　studied　widely.　The　results　show　that　the　microstructure　of　the　alloy　was　modified,　the　mechanical　properties　and　other　performances　such　as　electrical　conductivity　and　corrosion　resistance　of　the　alloy　were　improved　as　well.　In　our　research,　the　effects　of　La,　Ce,　Nd,　Y,　Gd,　Sc　and　Er　on　the　microstructure,　tensile　properties,　corrosion　resistance　of　high-purified　aluminum　and　it＇s　alloy　are　investigated.　It　is　concluded　that　those　rare　earth　elements　are　all　of　benefit　to　aluminum　and　it＇s　alloys,　and　Er　is　one　of　the　most　effective　additives.　Compared　with　the　high-purified　aluminum,　Al-Er　alloy　is　featured　with　refined　grain　structure,　higher　hardness　and　greater　intensity,　while　the　plasticity　is　unchanged.