By　using　an　extended　Melnikov　method　on　multi-degree-of-freedom　Hamiltonian　systems　with　perturbations,　the　global　bifurcations　and　chaotic　dynamics　are　investigated　for　a　parametrically　excited,　simply　supported　rectangular　buckled　thin　plate.　The　formulas　of　the　rectangular　buckled　thin　plate　are　derived　by　using　the　von　Karman　type　equation.　The　two　cases　of　the　buckling　for　the　rectangular　thin　plate　are　considered.　With　the　aid　of　Galerkin＇s　approach,　a　two-degree-of-freedom　non-autonomous　nonlinear　system　is　obtained　for　the　non-autonomous　rectangular　buckled　thin　plate.　The　high-dimensional　Melnikov　method　developed　by　Yagasaki　is　directly　employed　to　the　non-autonomous　ordinary　differential　equation　of　motion　to　analyze　the　global　bifurcations　and　chaotic　dynamics　of　the　rectangular　buckled　thin　plate.　Numerical　method　is　used　to　find　the　chaotic　responses　of　the　non-autonomous　rectangular　buckled　thin　plate.　The　results　obtained　here　indicate　that　the　chaotic　motions　can　occur　in　the　parametrically　excited,　simply　supported　rectangular　buckled　thin　plate.