A sulfate Zn-Fe alloy electroplating process and new brightener was described, and the influences of ion concentration of plating, mass concentration of FeSO₄ ·7 H₂O, dosage of brightener, cathode current density, pH, temperature on the surface of coating and iron content were discussed. The results showed that the mass fraction of iron in the coating decreases as the ion concentration of zinc and iron as well as temperature increased. As the incrase of cathode current density as well as pH it increase first , when reaching a value the mass fraction Fe in the coating increases with their mass fraction decreases.It incrases as the increase of the concentration of FeSO₄ ·7 H₂O. The article found out the optimum plating and explored the influence of new brightener on the coating.