Abstract: The relationship between cathode potential with Ni-P amorphous alloy formed during the process of electrolytic deposition was studied. The result indicates that it is often formed at the terrace of cathode polarization curve. The effect of electroplating conditions on forming Ni-P amorphous alloy was also researched.When the content of H₃PO₃ in the bath amounts to a certain ratio an amorphous deposition can be easily formed at higher temperature, lower pH and proper current density The higher content of H₃PO₃ in bath, the higher the content of P in deposit.When the content of P in deposit exceeds 9% the amorphous are formed. The resistance to corrosion for the deposition increases with an increase in phosphor content. The effect of annealed temperature on the properties of Ni-P amorphous was examined.