In　order　to　research　the　microstructures　and　mechanical　properties　of　Mg-Gd-Er-Zn　wrought　magnesium　alloy　under　different　states.　Mg-Gd-Gd-Zn　alloy　was　prepared　by　conventional　metal　mold　casting,　solution　treatment,　subsequently　hot　extrusion　and　ageing　treatment,　and　was　studied　by　using　optical　microscopy　(OM),　X-ray　diffraction　(XRD),　scanning　electron　microscopy　(SEM)　and　transmission　electron　microscopy　(TEM).　The　results　show　that　the　as-cast　microstructures　of　Mg-Gd-Er-Zn　alloy　consists　of　α-Mg　matrix　and　second-phase　(Mg,Zn)3Gd　phase　which　distributes　around　α-Mg　matrix.　After　solution　treatment,　the　lamellar　long　period　stacking　ordered　(LPSO)　structure　appeared.　During　hot　extrusion,　the　grain　of　this　alloy　can　be　refined　dramatically.　And　subsequently　aged,　the　nano　β＇　phases　were　precipitated.　Finally,　the　tensile　strength,　yield　strength　and　elongation　of　the　aged　alloys　at　room　condition　reach　397.5　MPa,　359.0　MPa　and　6.0%,　respectively.　©　2017,　Editorial　Department　of　Journal　of　Beijing　University　of　Technology.　All　right　reserved.