Abstract: The bright Fe-Cr-P alloy film can be electroplated on the copper with using the amino acetic acid as the complex compound. The result by X-ray diffraction analysis shows that the structure of the film is Bmorphous.The contents of iron,chromium and phosphorus in films are determined by spectrophotometric methods. During the process of electroplating, the change of pH value in solution has drastic influence over the composition of alloy films,The suitable pH value is from 1.2 to 1.8.Raising the operating temperature will reduce the chromium content in alloy films. The cathodic process of the Fe-Cr-P alloy electroplating is under the step of the electrochemical dynamics.