The　AZ61　magnesium　alloy　sticks　and　wires　were　prepared　through　multi　-step　hot　rotary　swaging,　and　the　strength　of　AZ61　alloy　was　enhanced　by　grain　refinement　and　dynamic　precipitation　during　rotary　swaging　process.　The　dynamic　precipitation　mechanism　during　hot　rotary　swaging　was　also　discussed.　The　results　show　that　the　rotary　swaged　AZ61　alloys　exhibit　a　high　YS　of　302　MPa,　a　high　UTS　of　376　MPa　and　an　elongation　of　7%.　The　means　grain　size　in　rotary　swaged　AZ61　alloy　is　8　mu　m.　The　dynamically　precipitated　nanophases　during　rotary　swaging　process　of　AZ61　alloy　include　spherical　Mg17Al12　particles　(average　size　of　110　nm,　similar　to　6.5vol%)　and　spherical　Al6Mn　particles　(average　size　of　10　nm).　The　dynamic　precipitation　mechanism　during　rotary　swaging　process　is　as　follows:　rotary　swaging　is　a　high-frequency　pulse　forging　process　(the　pulse　forging　frequency　is　between　1500　and　6000　strokes　per　min)　during　which　plastic　deformation　intervals　alternate　with　aging　intervals.　These　crystal　defects　produced　during　plastic　deformation　such　as　dislocations　and　vacancies　provide　a　large　amount　of　nucleation　sites　for　precipitation.　The　aging　interval　during　each　pulse　period　is　as　short　as　0.05　s　and　hence　the　dynamic　precipitate　phases　do　not　grow　to　a　very　large　size.