Nonlinear　vibration　characteristics　of　composite　laminated　trapezoidal　plates　are　studied.　The　geometric　nonlinearity　of　the　plate　based　on　the　von　Karman＇s　large　deformation　theory　is　considered,　and　the　finite　element　method　(FEM)　is　proposed　for　the　present　nonlinear　modeling.　Hamilton＇s　principle　is　used　to　establish　the　equation　of　motion　of　every　element,　and　through　assembling　entire　elements　of　the　trapezoidal　plate,　the　equation　of　motion　of　the　composite　laminated　trapezoidal　plate　is　established.　The　nonlinear　static　property　and　nonlinear　vibration　frequency　ratios　of　the　composite　laminated　rectangular　plate　are　analyzed　to　verify　the　validity　and　correctness　of　the　present　methodology　by　comparing　with　the　results　published　in　the　open　literatures.　Moreover,　the　effects　of　the　ply　angle　and　the　length-high　ratio　on　the　nonlinear　vibration　frequency　ratios　of　the　composite　laminated　trapezoidal　plates　are　discussed,　and　the　frequency-response　curves　are　analyzed　for　the　different　ply　angles　and　harmonic　excitation　forces.