Abstract: This study researches the nonlinear vibration and dynamic response of Functionally Graded Graphene Platelets (FG-GPLs) reinforce eccentrically stiffened imperfection cylindrical Shellpanels. The governing equations are derived in the frame work of the classical Shelltheory coupled with the Von Karman nonlinearity terms. The effective modulus of elasticity for the composite panels and stiffeners is determined with the Halpin-Tsai technique while the rule of mixture is utilized to evaluate the Poisson’s ratio and mass density. Galerkin approach coupled with the Runge-Kutta method is employed to solve the nonlinear equation for the dynamic analysis of the Shellpanels. A comparative study is carried out with that available in the open literature to prove the validation of the obtained results. In numerical results, the influence of reinforcing the stiffeners with GPLs, weight fraction, GPLs distribution pattern, geometric parameters of stiffeners, imperfection factor and exciting force on the nonlinear dynamic response of the Shellpanels is analysed in details.