The　effect　of　rolling　temperature　on　microstructure　evolution　and　mechanical/thermal　properties　of　Mg-4Zn-1Mn-1.2Ce　alloy　was　investigated.　Results　indicate　that　Mg-Zn-Ce　(τ　phase)　second　phase　and　α-Mn　were　crushed　and　distributed　along　the　rolling　direction　in　the　as　hot-rolled　Mg-4Zn1Mn-1.2Ce　alloy.　When　the　rolling　temperature　was　lower　than　400°C,　most　grains　became　deformed　grains,　but　the　proportion　of　recrystallized　grains　increased　due　to　the　occurred　static　recrystallization　during　heat　preservation　in　the　intervals　between　rolling-passes　when　the　plate　was　rolled　at　425oC.　The　tensile　strength,　yield　strength　and　elongation　of　the　rolled　Mg-4Zn-1Mn-1.2Ce　alloy　sheet　were　386　MPa,　356　MPa　and　4.8%,　respectively,　as　well　as　the　thermal　conductivity　of　127.3　W·(m·K)-1　when　it　was　hot-rolled　at　375oC.　Annealing　has　resulted　in　a　slight　decrease　in　strength,　but　a　great　improvement　in　toughness.　In　the　case　of　the　alloy　rolled　at　375oC,　its　elongation　increased　from　4.8%　to　23.5%　after　annealed　at　400oC/60　min.　Also,　the　thermal　conductivity　of　the　annealed　alloy　decreased　about　4~9　W·(m·K)-1　in　comparison　with　that　of　the　as-rolled　one.　©　2024　Chinese　Journal　of　Materials　Research.　All　rights　reserved.