A TC4 homogeneous cantilever thin plate is taken as the research object. Based on the classical theories of plates and shells, the first fourth?order natural frequency of the cantilever plate with global and localized geometric imperfection is derived by founding the modal functions of the cantilever boundary condition through the Rayleigh?Ritz method. The influences of the type, size and location of the imperfections of cantilever plate on natural vibration are discussed.