In　order　to　compare　nonlinear　vibration　response　of　the　different　enabled　materials　in　the　matrix　of　composites,　the　nonlinear　vibrations　of　a　composite　plate　reinforced　with　carbon　nanotubes(CNT)are　studied.　In　this　paper,　the　carbon　nanotubes　are　supposed　to　be　long　fibers.　The　nonlinear　governing　partial　differential　equations　of　motion　for　the　composite　rectangular　thin　plate　are　derived　by　using　the　Reddy＇s　third-order　shear　deformation　plate　theory,　the　von　Karman　type　equation　and　the　Hamilton＇s　principle.　Then,　the　governing　equations　get　reduced　to　ordinary　differential　equations　in　thickness　direction　with　variable　coefficients　and　these　are　solved　by　the　Galerkin　method.　The　case　of　1:1　internal　resonance　is　considered.　The　asymptotic　perturbation　method　is　employed　to　obtain　the　four-dimensional　averaged　equations.　The　numerical　method　is　used　to　investigate　the　periodic　and　chaotic　motions　of　the　composite　rectangular　thin　plate　reinforced　with　carbon　nanotubes.　The　results　of　numerical　simulation　demonstrate　that　there　exist　different　kinds　of　periodic　and　chaotic　motions　of　the　composite　plate　under　certain　conditions.　At　last,　the　nonlinear　vibration　responses　of　the　plate　are　compared　with　the　same　responses　of　angle-ply　composite　laminated　plates.　Copyright　©　2012　by　ASME.