Global　bifurcations　and　multi-pulse　chaotic　dynamics　are　studied　for　a　four-edge　simply　supported　composite　laminated　piezoelectric　rectangular　plate　under　combined　in-plane,　transverse,　and　dynamic　electrical　excitations.　Based　on　the　von　Karman　type　equations　for　the　geometric　nonlinearity　and　Reddy＇s　third-order　shear　deformation　theory,　the　governing　equations　of　motion　for　a　composite　laminated　piezoelectric　rectangular　plate　are　derived.　The　Galerkin　method　is　employed　to　discretize　the　partial　differential　equations　of　motion　to　a　three-degree-of-freedom　nonlinear　system.　The　six-dimensional　non-autonomous　nonlinear　system　is　simplified　to　a　three-order　standard　form　by　using　the　method　of　normal　form.　The　extended　Melnikov　method　is　improved　to　investigate　the　six-dimensional　non-autonomous　nonlinear　dynamical　system　in　mixed　coordinate.　The　global　bifurcations　and　multi-pulse　chaotic　dynamics　of　the　composite　laminated　piezoelectric　rectangular　plate　are　studied　by　using　the　improved　extended　Melnikov　method.　The　multi-pulse　chaotic　motions　of　the　system　are　found　by　using　numerical　simulation,　which　further　verifies　the　result　of　theoretical　analysis.