A　micromechanics　model　of　the　thermomechanical　constitutive　behavior　and　micro-structural　inhomogeneity　of　carbon　nanotubes　(CNTs)/shape　memory　polymer　(SMP)　composites　is　presented.　It　is　assumed　that　the　CNTs　are　elastic　and　the　SMP　obeys　a　thermomechanical　constitutive　law.　The　effective　properties　of　CNT/SMP　composites　are　examined　using　a　micro-mechanics　method.　The　effect　of　CNT　aggregation　in　the　composite,　frequently　encountered　in　real　engineering　situations,　is　studied.　The　degree　of　aggregation　is　described　by　an　aggregation　coefficient,　and　the　effective　properties　of　SMP　composites　with　aggregated　CNTs　are　calculated　using　a　stepping　scheme.　It　is　shown　that　the　degree　of　CNT　aggregation　dramatically　influences　the　effective　properties　of　the　CNT/SMP　composites.　A　homogeneous　microstructure　leads　to　maximum　levels　of　effective　composite　properties.　(C)　2011　Elsevier　Ltd.　All　rights　reserved.