2. Accelerator, fluoride, Mn2+, Ni2+, Zn2+ and PO4 were studied in detail by means of scanning electron microscope, X-ray diffraction, potential-time curve and film weight change. And Fe2+ on the phosphating process of aluminum. The results show that guanidine salt has the characteristics of good water solubility, low dosage and fast film formation, and is an effective accelerator for aluminum phosphating. Fluoride can promote film formation, increase film weight and refine grains. Mn2+ and Ni2+ can obviously refine the grain, make the phosphating film uniform and compact, and improve the appearance of the phosphating film. When the concentration of Zn2+ is low, no film or film difference can be formed. With the increase of Zn2+ concentration, the weight of the film increased. The content of PO4 has a great influence on the weight of phosphating film, which increases PO4. This content increases the weight of phosphating film.