Global　bifurcations　and　Shilnikov　type　multi-pulse　chaotic　dynamics　for　a　simply　supported　functionally　graded　material　(FGM)　rectangular　plate　are　studied　by　using　an　extended　Melnikov　method　for　the　first　time.　The　FGM　rectangular　plate　is　subjected　to　the　transversal　and　in-plane　excitations　in　the　uniform　thermal　environment.　Material　properties　are　assumed　to　be　temperature-dependent.　A　two-degree-of-freedom　nonlinear　system　governing　the　equation　of　motion　for　the　FGM　rectangular　plate,　which　includes　the　quadratic　and　cubic　nonlinear　terms　is　derived　by　using　Hamilton＇s　principle　and　Galerkin＇s　method.　The　resonant　case　considered　here　is　1:1　internal　resonance,　principal　parametric　resonance　and　1/2-subharmonic　resonance.　The　averaged　equation　governing　the　amplitudes　and　phases　of　the　second-order　approximate　solution　is　obtained　by　using　the　method　of　multiple　scales.　After　transforming　the　averaged　equation　into　a　standard　form,　the　extended　Melnikov　method　is　employed　to　indicate　the　existence　of　the　Shilnikov　type　multi-pulse　chaotic　motions.　We　are　able　to　obtain　the　explicit　restrictive　conditions　on　the　damping,　excitations　and　the　detuning　parameters,　under　which　the　multi-pulse　chaotic　dynamics　is　expected.　The　results　of　numerical　simulation　also　illustrate　that　there　exist　the　multi-pulse　chaotic　responses　of　the　FGM　rectangular　plate.