The　nonlinear　vibrations　and　chaotic　motions　of　a　simply　supported　symmetric　cross-ply　composite　laminated　piezoelectric　rectangular　plate　subjected　to　the　transverse　and　in-plane　excitations　are　analyzed　in　the　case　of　primary　parametric　resonance　and　1:3　internal　resonance.　It　is　assumed　that　different　layers　of　the　symmetric　cross-ply　composite　laminated　piezoelectric　rectangular　plate　are　perfectly　bonded　to　each　other　and　with　piezoelectric　actuator　layers　embedded　in　the　plate.　Based　on　the　Reddy＇s　third-order　shear　deformation　plate　theory,　the　nonlinear　governing　equation　of　motion　for　the　composite　laminated　piezoelectric　rectangular　plate　is　derived　by　using　the　Hamilton＇s　principle.　The　Galerkin＇s　approach　is　employed　to　discretize　the　partial　differential　governing　equation　to　a　two-degree-of-freedom　nonlinear　system　under　combined　the　parametric　and　external　excitations.　The　method　of　multiple　scales　is　utilized　to　obtain　the　four-dimensional　averaged　equation.　Numerical　method　is　used　to　find　the　bifurcation　diagram,　the　periodic　and　chaotic　motions　of　the　composite　laminated　piezoelectric　rectangular　plate.　The　numerical　results　illustrate　the　existence　of　the　periodic　and　chaotic　motions　in　the　averaged　equation.　It　is　found　that　the　chaotic　responses　are　especially　sensitive　to　the　forcing　and　the　parametric　excitations.　The　influences　of　the　transverse,　in-plane　and　piezoelectric　excitations　on　the　bifurcations　and　chaotic　behaviors　of　the　composite　laminated　piezoelectric　rectangular　plate　are　investigated　numerically.