Accumulative Roll-Bonding of I 100 Aluminium. alloy strip is conducted by continuous cold rolling. Four 1mm thick 1m long strips are stacked and roll-bonded into a 1mm strip on a four-stand elongation-control mill. The rolling is performed without interstand force or with interstand tensile/compressive force. The rolled strip is cut into four pieces and supplied to a subsequent ARB cycle. It is found that the interstand compressive force suppresses edge cracks and fracture during rolling. The tensile strength increases with the number of ARB cycles from 78MPa (initial) to 282MPa (after four cycles). On the other hand, the elongation decreases abruptly at the first cycle, and gradually to 8% after four cycles. The strip rolled with the compressive force shows higher elongation. Although pancake-shaped ultrafine grains are formed after three cycles in spite of the interstand force, the compressive force makes the grains finer and more equiaxed. It is concluded that production of ultrafine-grained coiled strips is feasible by ARB with a tandem mill, and that application of interstand compressive force is beneficial to ultragrain refinement as well as yield efficiency.