Abstract: Buckling of a delaminated laminate or one of itssublaminatescan cause high interlaminar stresses which, in turn, lead to delamination growth. Hence, buckling loads are important parameters to asses the loss of strenth and stiffness. The objective of this paper is to pridict the buckling of strip delamination. The delaminated laminate is regarded as two independent sublaminates and the matrix between them is simulated by tension-compression bars and shear plates. So, an one-dirnensional mechanical model is established. The eigenvalue equtions are formulated with the help of Rayleigh-Ritz energy method.Global buckling or sublaminate local buckling may occur in the laminate. The critical loads of both types are calculated for a range of ratios of two sublaminates stiffness properties and clifferent lengths of the delaminated region.