The　nonlinear　vibrations　of　a　composite　laminated　cantilever　rectangular　plate　subjected　to　the　in-plane　and　transversal　excitations　are　investigated　in　this　paper.　Based　on　the　Reddy＇s　third-order　plate　theory　and　the　von　Karman　type　equations　for　the　geometric　nonlinearity,　the　nonlinear　partial　differential　governing　equations　of　motion　for　the　composite　laminated　cantilever　rectangular　plate　are　established　by　using　the　Hamilton＇s　principle.　The　Galerkin　approach　is　used　to　transform　the　nonlinear　partial　differential　governing　equations　of　motion　into　a　two　degree-of-freedom　nonlinear　system　under　combined　parametric　and　forcing　excitations.　The　case　of　foundational　parametric　resonance　and　1:1　internal　resonance　is　taken　into　account.　The　method　of　multiple　scales　is　utilized　to　obtain　the　four-dimensional　averaged　equation.　The　numerical　method　is　used　to　find　the　periodic　and　chaotic　motions　of　the　composite　laminated　cantilever　rectangular　plate.　It　is　found　that　the　chaotic　responses　are　sensitive　to　the　changing　of　the　forcing　excitations　and　the　damping　coefficient.　The　influence　of　the　forcing　excitation　and　the　damping　coefficient　on　the　bifurcations　and　chaotic　behaviors　of　the　composite　laminated　cantilever　rectangular　plate　is　investigated　numerically.　The　frequency-response　curves　of　the　first-order　and　the　second-order　modes　show　that　there　exists　the　soft-spring　type　characteristic　for　the　first-order　and　the　second-order　modes.