Al-4Cu（mass fraction

%）alloy billets were prepared by electromagnetic stirring

and reheating melting experiment was carried out.The distribution of Cu elements was analyzed in the alloy billets at as-cast

electromagnetic stirring and reheating melting condition

respectively.The results show that Cu element is segregated at the grain boundaries after electromagnetic stirring

especially at grain boundary junction.The number of precipitated Cu-contained compounds is less than that in the grains without electromagnetic stirring.With the increase of the magnetic field strength

segregation of Cu element becomes more serious increasingly

and the segregation of Cu element is increased from the surface to the core at radial direction of cylindrical billet.Reheating melting can change the distribution of Cu element in the semi-solid billet

in which the degree of change is relevant to the fraction of remelting liquid volume.When the volume of remelting liquid is low

Cu elements still enrich in the non-remelting solid phases

while the distribution of Cu element will be uniform at the remelting zone.Reheating melting eventually enlarge the differences of Cu average content at remelting and non remelting zone.