Abstract: In this paper, the integral bending and buckling of composite sandwich beam is researched. Based on the differential relations of the axial displacement and the bending deflection of the composite sandwich beam, the bending differential equation of sandwich beam is obtained. Using the bending differential equation, the analytical solution of integral bending and buckling of composite sandwich beam can be obtained. The experimental results show that the deflection analytical solution of the sandwich beam with integral bending has higher precision.