Nonlinear　dynamic　behaviors　of　a　simply　supported　honeycomb　sandwich　plate　subjected　to　the　transverse　excitations　are　investigated　in　this　paper.　Based　on　the　classical　thin　plate　theory　and　Von　Karman　large　deformation　theory,　the　governing　equation　of　motion　for　the　honeycomb　sandwich　plate　is　established　by　using　the　Hamilton　principle.　The　nonlinear　governing　partial　differential　equation　is　discretized　to　the　ordinary　differential　equations　by　differential　quadrature　method　and　then　solved　by　Runge-Kutta-Fehlberg　method.　Based　on　the　numerical　simulations,　combined　with　nonlinear　dynamic　theory,　the　influences　of　the　frequency　and　amplitude　of　the　transverse　excitation　are　investigated　respectively　by　using　the　bifurcation　diagrams,　Poincare　maps　and　phase　portraits.　The　results　exhibit　the　existence　of　the　period-1,　period-2　and　chaotic　responses　with　the　variation　of　the　excitations,　which　demonstrate　that　those　motions　appear　alternately.