The　nonlinear　oscillations　and　chaotic　motion　of　a　simply　supported　angle-ply　composite　laminated　rectangular　thin　plate　with　parametric　and　external　excitations　were　investigated,　an　asymptotic　perturbation　method　was　presented　based　on　Fourier　expansion　and　temporal　rescaling　to　solve　the　ordinary　differential　equation　of　the　system.　According　to　Reddy＇s　third-order　plate　theory,　the　governing　equations　of　motion　for　the　angle-ply　composite　laminated　rectangular　thin　plate　were　derived　by　using　Hamilton＇s　principle.　Then,　Galerkin　procedure　was　applied　to　the　partial　differential　governing　equation　to　obtain　a　2-DOF　nonlinear　system　including　quadratic　and　cubic　nonlinear　terms.　Such　equations　were　utilized　to　deal　with　the　resonant　case　of　1:　1　internal　resonance　and　primary　parametric　resonance-1/2　subharmonic　resonance.　Based　on　the　averaged　equation　obtained　with　the　asymptotic　perturbation　method,　the　phase　portrait　and　power　spectrum　were　used　to　analyze　the　multi-pulse　chaotic　motions　of　the　angle-ply　composite　laminated　rectangular　thin　plate.　Under　certain　conditions,　the　different　periodic　and　various　chaotic　motions　were　found　in　the　angle-ply　composite　laminated　rectangular　thin　plate.