Abstract: The influence of the amount of pure Cu addition on the organization and performance of the rolled aluminum foil billet was studied. Pure aluminum heating temperature of 720 ℃, different amounts of pure Cu was added separately to produce different cast aluminum foil billet. After rolling 4 times, the microstructural morphologies and mechanical properties of the aluminum foil billet before and after adding Cu were analyzed by using the tools of optical microscopy, scanning electron microscope and electronic tensile test machine. The results showed that adding pure Cu to aluminum foil refined the structure. With the increase of pure Cu addition, the structure of the aluminum foil billet became dense and uniform, and the produced CuAl₂ could increase the tensile capacity of aluminum foil. When annealing at 370 ℃ for 6 h and adding 0.5% of Cu, the microstructure grain size of the obtained aluminum foil billet was on the order of 10 μm, which was 75% smaller than that of 60 μm before Cu addition. Moreover, the tensile strength increased from 53.1 MPa to 100.2 MPa by 88.8%.