An　analysis　on　the　nonlinear　dynamics　of　a　clamped-clamped　FGM　circular　cylindrical　shell　subjected　to　an　external　excitation　and　uniform　temperature　change　is　presented　in　this　paper.　Material　properties　of　the　constituents　are　assumed　to　be　temperature-independent　and　the　effective　properties　of　FGM　cylindrical　shell　are　graded　in　thickness　direction　according　to　a　simple　power　law　function　in　terms　of　the　volume　fractions.　Based　on　the　first-order　shear　deformation　shell　theory　and　von　Karman　type　nonlinear　strain-displacement　relationship,　the　nonlinear　governing　equations　of　motion　are　derived　by　using　Hamilton＇s　principle.　Galerkin＇s　method　is　then　utilized　to　discretize　the　governing　partial　equations　to　a　two-degree-of-freedom　nonlinear　system　including　the　quadratic　and　cubic　nonlinear　terms　under　combined　external　excitations.　Numerical　results　including　the　bifurcations,　waveform,　phase　plots　and　Poincare　maps　are　presented　for　clamped-clamped　FGM　cylindrical　shells　showing　the　influences　of　material　gradient　index,　the　thickness　and　the　external　loading　on　the　nonlinear　dynamics.　(C)　2011　Elsevier　Ltd.　All　rights　reserved.