Al/AZ31 multilayered composite was fabri- cated by ARB process. A scanning electron microscope （SEM） equipped with energy dispersive X-ray spectrometer （ EDS ） was used for the observation of the cross-section of the ARB processed Al/AZ31 multilayered composite. The micro-hardness of the crosssection was also measured. SEM observation of the cross-section showed that Al/AZ31 muhilayer compos-ite could be fabricated successfully. EDS line-scan analysis indicated that there was diffusion layer at the interface between the Al layer and AZ31 layer and the thickness of the diffusion layer would be thicker and thicker with the increase of the ARB cycles. The strength of the Al and AZ31 layers would also increase, and there was gradient hardness at the Al/ AZ31 interface diffusion layer.