A　micromechanical　model　of　reticulate　carbon　nanotube　(R-CNT)　composite　is　theoretically　constructed　to　study　its　overall　behaviour　under　large　deformation.　Using　incremental　form　of　two-scale　expansion　method　for　large　deformed　material,　the　overall　stress-strain　relations　of　R-CNT　composites　are　predicted.　The　influences　of　microstructural　parameters　and　volume　fraction　of　the　CNT　on　the　overall　mechanical　properties　of　the　R-CNT　composite　are　investigated　for　the　design　consideration　of　new　composites　with　optimal　properties.　It　is　shown　that　the　effective　properties　of　the　R-CNT　composites　have　a　serious　microstructural　dependence　for　the　large　deformation　situation.