This　paper　studies　the　thermomechanical　low-velocity　impact　behaviors　of　geometrically　imperfect　nanoplatelet-reinforced　composite　(GRC)　beams　considering　the　von　K　&　aacute;rm　&　aacute;n　nonlinear　geometric　relationship.　The　graphene　nanoplatelets　(GPLs)　are　assumed　to　have　a　functionally　graded　(FG)　distribution　in　the　matrix　beam　along　its　thickness,　following　the　X-pattern.　The　Halpin-Tsai　model　and　the　rule　of　mixture　are　employed　to　predict　the　effective　Young　modulus　and　other　material　properties.　Dividing　the　impact　process　into　two　stages,　the　corresponding　impact　forces　are　calculated　using　the　modified　nonlinear　Hertz　contact　law.　The　nonlinear　governing　equations　are　obtained　by　introducing　the　von　K　&　aacute;rm　&　aacute;n　nonlinear　displacement-strain　relationship　into　the　first-order　shear　deformation　theory　and　dispersed　via　the　differential　quadrature　(DQ)　method.　Combining　the　governing　equation　of　the　impactor＇s　motion,　they　are　further　parametrically　solved　by　the　Newmark-beta　method　associated　with　the　Newton-Raphson　iterative　process.　The　influence　of　different　types　of　geometrical　imperfections　on　the　nonlinear　thermomechanical　low-velocity　impact　behaviors　of　GRC　beams　with　varying　weight　fractions　of　GPLs,　subjected　to　different　initial　impact　velocities,　are　studied　in　detail.