An　extraordinary　high-strength-toughness　Mg-11.8Gd-1.9Er-0.4Zr　(wt%)　alloy　has　been　successfully　fabricated　by　400　cycles　of　repeated　plastic　working　process　followed　by　hot　extrusion.　The　sample　exhibited　an　ultimate　tensile　strength　of　500　MPa,　tensile　yield　strength　of　455　MPa,　companying　with　a　failure　elongation　of　12.0%　at　room　temperature.　The　significant　enhancement　in　mechanical　properties　was　attributed　to　the　grain　refinement,　homogeneous　beta　phase　and　modified　texture.　(C)　2013　Elsevier　B.V.　All　rights　reserved.