Alloying　seriously　deteriorates　the　thermal　conductivity　of　magnesium　(Mg)　alloys,　thus,　restricts　their　applications　in　the　fields　of　computer,　communication,　and　consumer　products.　In　order　to　improve　the　thermal　conductivity　of　Mg　alloys,　adding　carbon　nanotube　(CNT)　combined　with　aging　treatment　is　proposed　in　this　work,　i.e.　fabricating　the　D-CNT　(a　kind　of　dispersed　CNT)　reinforced　ZK61　matrix　composite　via　powder　metallurgy,　and　conducting　aging　treatment　to　the　composite.　Results　indicate　the　as-aged　ZK61/0.6　wt.%　D-CNT　composite　achieved　an　excellent　thermal　conductivity　of　166　W/(mK),　exhibiting　52.3%　enhancement　in　comparison　with　matrix,　as　well　as　tensile　yield　strength　of　321　MPa,　ultimate　tensile　strength　of　354　of　MPa,　and　elongation　of　14%.　The　simultaneously　enhanced　thermal　conductivity　and　mechanical　performance　are　mainly　attributed　to:　(1)　the　embedded　interface　of　the　D-CNT　with　matrix　and　(2)　the　coherent　interface　of　precipitates　with　matrix.　It　is　expected　the　current　work　can　provide　a　clue　for　devising　Mg　matrix　composites　with　integrated　structural　and　functional　performances,　and　enlarge　the　current　restricted　applications　of　Mg　alloys.　(c)　2023　Chongqing　University.　Publishing　services　provided　by　Elsevier　B.V.　on　behalf　of　KeAi　Communications　Co.　Ltd.　This　is　an　open　access　article　under　the　CC　BY-NC-ND　license　(　http://creativecommons.org/licenses/by-nc-nd/4.0/　)　Peer　review　under　responsibility　of　Chongqing　University