Magnesium　(Mg)　alloys　with　integrated　structural-functional　performance　have　broad　applications　in　the　fields　of　defense　and　military　industry,　transportation　and　electronic　communication,　etc.　Developing　Mg　alloy　sheets　with　synergistic　mechanical　property　and　thermal　conductivity　is　a　key　to　achieving　these　applications.　The　effects　of　rolling　temperature　and　cumulative　strain　on　the　microstructure　evolution　and　mechanical　property　and　thermal　conductivity　of　solid-solution　Mg-6Gd-1Er-6Zn-0.5Zr　(mass　fraction,　%,　GEZ616K)　alloy　were　investigated.　The　results　show　that,　as　the　rolling　temperature　increasing,　the　microstructures　of　the　sheet　with　cumulative　deformation　strain　of　80%　undergo　transformation　process　from　mixed　crystallization　at　low-temperature　to　uniform　fine　recrystallization　and　grain　coarsening　at　high　temperature.　At　the　same　time,　the　basal　texture　weakens,　the　proportion　of　large　angle　grain　boundary　increases,　and　dislocation　density　in　the　alloy　decreases.　At　a　certain　rolling　temperature,　the　number　of　twins　gradually　decreases　and　the　proportion　of　recrystallization　gradually　increases　with　the　increase　of　the　cumulative　strain,　resulting　in　a　synchronous　improvement　of　mechanical　property　and　thermal　property.　The　GEZ616K　alloy　rolled　at　425　℃　with　cumulative　strain　of　80%　exhibits　the　excellent　mechanical　property　and　thermal　property,　the　tensile　strength,　yield　strength　and　elongation　are　280　MPa,　227　MPa　and　11.4%,　respectively,　as　well　as　the　thermal　diffusion　coefficient　of　72.9　mm2/s　and　the　thermal　conductivity　of　135.3　W/(m·K).　©　2024　Central　South　University　of　Technology.　All　rights　reserved.