A　micromechanical　model　is　presented　in　order　to　model　effective　properties　and　microstructural　inhomogeneity　of　CNT/SMP　composites.　It　is　assumed　that　the　CNT　is　elastic　and　the　SMP　obeys　a　thermo-mechanical　constitutive　law.　The　aggregated　effect　of　CNT　in　a　composite,　which　frequently　encounters　in　real　engineering,　is　considered　by　a　two-step　homogenization　approach.　The　aggregation　degree　of　CNT　is　described　by　an　aggregation　coefficient.　The　effective　properties　of　CNT/SMP　composites　with　aggregated　inclusions　are　estimated　by　Mori-Tanaka　method.　It　is　shown　that　the　aggregation　of　CNT　can　influence　dramatically　the　effective　properties　of　the　CNT/SMP　composites.　©　2010　ASCE.