Delamination has been a subject of major concern in engineering applications of composite laminates by manufacturing defects or an impact.In this paper we investigated buckling behavior of composite laminates containing embedded delamination with circular shape.Firstly we use Rayleigh-Ritz methods to create modeling of composite laminate with the circular delamination. Through theoretical analysis,the displacement of specimen surface will be counted when the bucking happens.The bending load-dispalcement curves can be calculated at an arbitrary bending load M. After the theoretical analysis, 3D digital image correlation was used to measure the evolution of the deformation of the laminate during bending to structural failure and the resulting full-field displacement maps.The theoretical model results are in agreement with the expermental results.The theory proves to be accurate and can be used to evaluate the critical buckling load of delaminated composite laminates under pure bending.