Carbon　nanotube　reinforced　natural　rubber　composites　(CNT/NRs)　have　been　increasingly　used　in　industry.　However,　due　to　the　large　aspect　ratio　and　high　curling　of　CNTs,　the　traditional　theoretical　models　that　have　been　used　for　inclusion-reinforced　composites　cannot　be　applied　to　CNT/NRs　directly.　Therefore,　a　longer　time　is　needed　to　predict　the　elastic　properties　of　CNT/NRs　in　experiments.　In　this　work,　the　classical　macroscopic　model　and　mesoscopic　method　were　used　to　predict　the　elastic　performance　of　CNT/NRs　prepared　by　the　latex　blending　method.　Three　types　of　phenomenological　models　were　employed:　Mooney–Rivlin,　Ogden,　and　Yeoh.　A　comparison　with　the　experimental　results　shows　that　the　Ogden　model　describes　the　constitutive　behavior　of　CNT/NRs　more　accurately.　In　addition,　at　the　mesoscale,　the　Halpin–Tsai　equation,　Mori–Tanaka　model,　and　finite　element　method　were　employed　to　predict　the　elastic　modulus　based　on　the　persistent　length　theory.　The　stress-strain　curves　under　large　deformations　were　compared　with　those　of　the　experimental　results.　Therefore,　the　applicability　of　the　three　mesoscale　models　were　verified　for　the　CNT/NRs　studied　in　this　work.　©　2024,　The　Polymer　Society,　Taipei.