To　study　the　damage　evolution　behavior　of　composite　laminates　under　torsion　process　is　a　challenging　task　during　industry　applications.　In　this　work,　torsion　experiments　were　carried　out　on　the　composite　specimens　with　different　off-axis　angles　to　study　the　damage　evolution　behavior　of　carbon　fiber-reinforced　composites　by　using　acoustic　emission,　Micro-CT,　and　the　scanning　electron　microscope　(SEM).　The　collected　acoustic　signals　during　torsion　were　analyzed　by　fuzzy　c-means　algorithm,　and　the　results　show　that　the　acoustic　signals　can　be　divided　into　three　clusters,　which　correspond　to　matrix　cracking,　fiber/matrix　debonding,　delamination　and　fiber　breakage.　These　damages　were　observed　and　confirmed　by　applying　Micro-CT　and　SEM.　What＇s　more,　it　is　shown　that　off-axis　angle　can　improve　the　toughness　of　the　composite　specimen　during　the　torsion　process.　As　the　off-axis　angle　increases,　the　peak　frequency　of　the　AE　signal　for　corresponding　clusters　also　increases.　Overall,　combining　AE　technique,　Micro-CT,　and　SEM　provides　guidance　for　health　monitoring　of　composite　structure　under　torsion　with　different　off-axis　angle　structures.