In　the　present　work,　the　chaotic　wave　motions　and　the　chaotic　dynamic　responses　are　investigated　for　a　four-edge　simply　supported　piezoelectric　composite　laminated　rectangular　thin　plate　subjected　to　the　transverse　and　the　in-plane　excitations.　Based　on　the　reductive　perturbation　method,　the　complicated　partial　differential　nonlinear　governing　equation　of　motion　for　the　piezoelectric　composite　laminated　rectangular　thin　plate　subjected　to　the　transverse　and　the　in-plane　excitations　is　transformed　into　an　equivalent　and　soluble　nonlinear　wave　equation.　The　heteroclinic　orbit　and　resonant　torus　are　obtained　for　the　unperturbed　nonlinear　wave　equation.　The　topological　structures　of　the　unperturbed　and　the　perturbed　nonlinear　wave　equations　are　investigated　on　the　fast　and　the　slow　manifolds.　The　persistence　of　the　heteroclinic　orbit　is　studied　for　the　perturbed　nonlinear　wave　equation　through　the　Melnikov　method.　The　geometric　analysis　is　utilized　to　prove　that　the　heteroclinic　orbit　goes　back　to　the　stable　manifold　of　the　saddle　point　on　the　slow　manifold　under　the　perturbations.　The　existence　of　the　homoclinic　orbit　is　conformed　for　the　perturbed　nonlinear　wave　equation　by　the　first　and　the　second　measures.　When　the　homoclinic　orbit　is　broken,　the　chaotic　motions　occur　in　the　Smale　horseshoe　sense　for　the　piezoelectric　composite　laminated　rectangular　thin　plate　subjected　to　the　transverse　and　the　in-plane　excitations.　Numerical　simulations　are　finished　to　study　the　influence　of　the　damping　coefficient　on　the　propagation　properties　of　the　piezoelectric　composite　laminated　rectangular　thin　plate　subjected　to　the　transverse　and　the　in-plane　excitations.　Both　theoretical　study　and　numerical　simulation　results　indicate　the　existence　of　the　chaotic　wave　motions　and　the　chaotic　dynamic　responses　of　the　piezoelectric　composite　laminated　rectangular　thin　plate　subjected　to　the　transverse　and　the　in-plane　excitations.