The　Shilnikov-type　multipulse　orbits　and　chaotic　dynamics　for　a　simply　supported　rectangular　thin　plate　under　combined　parametric　and　external　excitations　are　studied　in　this　paper　for　the　first　time.　The　rectangular　thin　plate　is　subjected　to　spatially　and　temporally　varying　transversal　and　in-plane　excitations,　simultaneously.　The　formulas　of　the　rectangular　thin　plate　are　derived　from　the　von　Karman　equation　and　Galerkin＇s　method.　The　method　of　multiple　scales　is　used　to　find　the　averaged　equation　in　the　case　of　1:　2　internal　resonance.　Based　on　the　averaged　equation,　the　theory　of　normal　form　is　used　to　obtain　the　explicit　expressions　of　normal　form　associated　with　a　double　zero　and　a　pair　of　purely　imaginary　eigenvalues　using　the　Maple　program.　The　dissipative　version　of　the　energy-phase　method　is　utilized　to　analyze　the　multipulse　global　bifurcations　and　chaotic　dynamics　of　a　parametrically　and　externally　excited　rectangular　thin　plate.　The　global　dynamical　analysis　indicates　that　there　exist　the　multipulse　jumping　orbits　in　the　perturbed　phase　space　of　the　averaged　equation　for　a　parametrically　and　externally　excited　rectangular　thin　plate.　These　results　show　that　the　chaotic　motions　of　the　multipulse　Shilnikov-type　can　occur　for　a　parametrically　and　externally　excited　rectangular　thin　plate.　Numerical　simulation　results　are　presented　to　verify　the　analytical　predictions.　It　is　also　found　from　the　results　of　numerical　simulation　that　the　Shilnikov-type　multipulse　orbits　exist　for　a　parametrically　and　externally　excited　thin　plate.