Texture　evolution,　microstructure　and　mechanical　properties　of　an　extruded　Mg-10Gd-1Zn-0.4Zr　alloy　during　annealing　were　investigated.　A　bimodal　microstructure　containing　coarse　deformed　grains　and　fine　dynamically　recrystallized　grains　is　observed　when　the　annealing　temperature　is　lower　than　200　°C.　Many　Mg5(Gd,　Zn)　phases　are　formed　in　the　alloy　annealed　at　200　°C.　Further　upon　increasing　the　annealing　temperature,　static　recrystallization　occurs　and　lamellar　LPSO　phase　forms　within　the　matrix.　When　the　annealing　temperature　reaches　500　°C,　an　obvious　grain　growth　is　observed,　and　Zn2Zr3　phases　form.　Meanwhile,　the　dominant　texture　component　transforms　from　the　basal　texture　(　parallel　to　extrusion　direction)　to　an　abnormal　texture　(　parallel　to　extrusion　direction),　which　is　attributed　to　the　growth　preference　of　the　grains　with　abnormal　texture.　The　alloy　annealed　at　200　°C　possesses　the　optimal　mechanical　properties　with　the　yield　strength　of　320　MPa,　the　ultimate　strength　of　368　MPa　and　elongation　of　18.4　%.　The　contribution　of　each　strengthening　mechanism　to　the　yield　strength　in　annealed　alloys　is　calculated　quantitatively.　Compared　to　the　as-extruded　alloy,　the　increment　of　the　yield　strength　in　the　alloy　annealed　at　200　°C　is　mainly　due　to　the　increase　in　secondary　phase　strengthening,　while　the　decrement　of　the　yield　strength　in　the　alloy　annealed　at　500　°C　is　attributed　to　the　reduction　of　grain　boundary　strengthening.　This　work　sheds　light　on　adjusting　the　texture　and　mechanical　properties　of　the　extruded　Mg　alloys　via　annealing　treatment.　©　2023　The　Authors