The　nonlinear　dynamics　of　a　cantilevered　piezoelectric　rectangular　plate　are　studied,　which　are　simultaneously　forced　by　the　base　excitation　and　the　excitation　loaded　by　piezoelectric　layers.　The　nonlinear　partial　differential　governing　equations　of　motion　for　the　system　are　established　by　using　the　Hamilton＇s　principle.　The　Galerkin　approach　is　used　to　discretize　the　partial　differential　equations　to　the　ordinary　differential　equations　with　four-degree-of-freedom.　Numerical　simulations　are　presented　to　investigate　the　effects　of　the　voltage　excitation　on　the　steady-state　responses　of　the　cantilevered　piezoelectric　plate.　The　bifurcation　diagram　of　the　system　for　W-1,　W-2,　W-3,　W-4　via　the　voltage　excitation　amplitude　is　obtained.　The　motions　of　the　system　can　be　shown　as　follows:　the　chaotic　motion　-＞　the　multiple　periodic　motion　-＞　the　periodic　motion　-＞　the　chaotic　motion.　Based　on　the　above　bifurcation　diagrams,　the　voltage　excitation　amplitude　are　changed　to　obtain　the　waveforms,　two-dimensional　phase　portraits,　three-dimensional　phase　portraits　and　Poincare　maps.　The　results　show　that　the　amplitude　of　the　system　can　reduce　effectively　and　keep　the　stability　by　adjusting　the　voltage　excitation.