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　degrees　C.　Many　Mg-5(Gd,　Zn)　phases　are　formed　in　the　alloy　annealed　at　200　degrees　C.　Further　upon　increasing　the　annealing　temperature,　static　recrystallization　occurs　and　lamellar　LPSO　phase　forms　within　the　matrix.　When　the　annealing　temperature　reaches　500vC,　an　obvious　grain　growth　is　observed,　and　Zn2Zr3　phases　form.　Meanwhile,　the　dominant　texture　component　transforms　from　the　basal　texture　(＜　10＜(1)over　bar＞0　＞　parallel　to　extrusion　direction)　to　an　abnormal　texture　(＜0001＞　parallel　to　extrusion　direction),　which　is　attributed　to　the　growth　preference　of　the　grains　with　abnormal　texture.　The　alloy　annealed　at　200　degrees　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　degrees　C　is　mainly　due　to　the　increase　in　secondary　phase　strengthening,　while　the　decrement　of　the　yield　strength　in　the　alloy　annealed　at　500　degrees　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.