The laminated composite sheet of LZ91 and AA1050 was prepared by accumulative roll bonding（ARB）.The effects of stacking rolling cycles on mechanical properties and microstructure of the composite sheet were investigated by tensile machine,optical microscope,scanning electron microscope and X ray diffraction.The results show that thickness of the composites sheet after 3 cycles rolling are very close.The average particle size of theαphase in the LZ91 layer parallel to the rolling force is decreased to 0.3μm from 2μm,and the grain refinement effect of subsequent rolling can be ignored.With the increase of the rolling cycles,the mechanical properties of the composite sheet are increased firstly and then reduced.The tensile strength,yield strength and microhardness of the composites sheet after 3 cycles rolling are increased by 42.11 MPa,71.93 MPa and HV16.5,respectively.New intermetallic compounds are absent in the LZ91/AA1050 lamellar composite sheets.