An　asymptotic　perturbation　method　is　presented　based　on　the　Fourier　expansion　and　temporal　rescaling　to　investigate　the　nonlinear　oscillations　and　chaotic　dynamics　of　a　simply　supported　angle-ply　composite　laminated　rectangular　thin　plate　with　parametric　and　external　excitations.　According　to　the　Reddy＇s　third-order　plate　theory,　the　governing　equations　of　motion　for　the　angle-ply　composite　laminated　rectangular　thin　plate　are　derived　by　using　the　Hamilton＇s　principle.　Then,　the　Galerkin　procedure　is　applied　to　the　partial　differential　governing　equation　to　obtain　a　two-degrees-of-freedom　nonlinear　system　including　the　quadratic　and　cubic　nonlinear　terms.　Such　equations　are　utilized　to　deal　with　the　resonant　case　of　1:1　internal　resonance　and　primary　parametric　resonance-1/2　subharmonic　resonance.　Furthermore,　the　stability　analysis　is　given　for　the　steady-state　solutions　of　the　averaged　equation.　Based　on　the　averaged　equation　obtained　by　the　asymptotic　perturbation　method,　the　phase　portrait　and　power　spectrum　are　used　to　analyze　the　multi-pulse　chaotic　motions　of　the　angle-ply　composite　laminated　rectangular　thin　plate.　Under　certain　conditions　the　various　chaotic　motions　of　the　angle-ply　composite　laminated　rectangular　thin　plate　are　found.