A method of the elastic analysis was studied for the double wall corrugated fiberboard (DWCF) made of kraftliners (KLs) and semichemical corrugating mediums (CMs) under the uniform bending in the moment axis perpendicular to the machine direction (MD). Then relationships between stresses, shapes and elastic moduli of KLs and CMs were discussed by this analysis method. The stress decrease of KL is induced by the increase of its KL strength, and the stress of CM increase with the increase of its CM strength. The stress of CM in the increase side of CM wavelength increases with the increase of the wavelength for CM, and stresses of KL and CM increase with the decrease of the CM wave-height. The maxium stress of KLs is on the outer surface in the low strength side, and the maximum stress of CMs is on the inner surface at the KL·CM joint in the low strength side.