Abstract: This paper presents a theoretical study of the dynamic characteristics of rotating thin-walled composite beams with shear deformation. A variational asymptotically approach is employed to describe the relationship between the displacement and strain, which also describes the shear deformation effects. Considering shear deformation and cross section warping, the equations of motion of the rotating beams are derived using Hamilton’s principle. The Galerkin method is used in order to analysis the free vibration behaviors of the model. Comparison of the theoretical solutions has been made with the results obtained from the finite element analysis, which prove the validity of the proposed model. Natural frequencies are obtained for two Circumferentially Uniform Stiffness (CUS) beams: box section composite beams and airfoil profile composite beams. The effects of fiber orientation, rotating speed and structure parameters on modal frequencies are investigated