The　magnesium　alloy　sheet　has　a　great　industrial　application　value,　but　the　further　application　has　been　restricted　because　of　its　inferior　formability.　Aim　to　this　problem,　the　Mg-xZn-0.5Er　alloy　sheets　were　produced　and　investigated　in　the　present　investigation.　The　effects　of　texture/second　phase　transformation　after　annealing　treatment　on　microstructure　and　properties　were　studied.　The　results　show　that　the　coarse　second　phase　promotes　the　occurrence　of　dynamic　recrystallization　(DRX),　resulting　in　refinement　of　deformed　microstructure.　Also,　this　coarse　phase　also　activates　the　static　recrystallization　(SRX),　and　both　the　microstructure　and　the　texture　are　further　modified,　but　the　strengths　of　these　sheets　are　reduced.　Moreover,　the　Index　Erichsen　(IE)　values　of　these　as-annealing　sheets　generally　decrease　at　room　temperature.　These　IE　values　are　negatively　correlated　with　the　content　of　second　phase,　and　the　presence　of　nano-scale　second　phase　further　make　IE　values　get　worse　at　room　temperature.　It　is　indicated　that　the　second　phase　plays　an　important　role　in　subduction　of　formability　improvement　by　texture　modifying.　These　second　phase　is　the　critical　factor　to　determine　the　formability　of　these　sheets　at　room　temperature.　©　2022,　China　Science　Publishing　&　Media　Ltd.　All　right　reserved.