Purpose　In　this　study,　nonlinear　forced　vibrations　of　a　functionally　graded　material　circular　conical　panel　under　the　transverse　excitation　and　the　in-plane　excitation　are　discussed.　Method　The　temperature　field　of　the　system　is　considered　as　a　steady-state　temperature.　Material　properties　of　temperature-dependence　for　the　system　vary　along　the　thickness　direction　in　the　light　of　a　power　law.　The　nonlinear　geometric　partial　differential　equations　expressed　by　general　displacements　are　derived　by　the　first-order　shear　deformation　theory　and　Hamilton＇s　principle.　Furthermore,　the　ordinary　differential　equations　of　the　system　are　acquired　by　the　Galerkin　method.　The　nonlinear　dynamic　behaviors　of　the　system　are　fully　analyzed.　Results　Based　on　numerical　simulations,　time　history　records,　Poincare　maps,　phase　portraits　and　bifurcation　diagrams　are　depicted　to　clarify　the　existence　of　complex　nonlinear　dynamic　behaviors　of　the　system.