Materials　and　processing　designs　for　advanced　magnesium　alloys　with　fine　microstructures　and　superior　properties　were　established　by　the　combination　of　the　repeated　plastic　working　and　the　Mg2Si　synthesis　in　solid-state.　The　grain　size　was　less　than　1　mu　m　via　RPW　process　due　to　its　severe　plastic　working　on　raw　powder.　The　hot　extruded　magnesium　alloys　produced　in　industries　showed　high　ultimate　tensile　strength,　e.g.　420　similar　to　450MPa,　when　employing　Mg-Zn-Al-Ca-RE　(Rare　Earth)　alloy　coarse　powder,　having　0.5　similar　to　2　mm　diameter,　as　input　materials.