The electrodeposited iron-nickel alloys with composition ranging from 10 to 27 at% Fe were investigated by means of Mossbauer spectroscopy etc. Distribution of the hyperfine field in these f. c. c. iron-nickel alloys was determined from the observed Mossbauer spectra. The relation between the widths of the outer and the inner lines was discussed. The intensity ratios of six lines were not equal to 3:2:1:1:2:3 since the ferromagnetic domain distribution in the samples was not random. The influence of the distribution of the electrical field in the bath was discussed. The great change in intensities of the second and the fifth lines for samples with same composition was observed. This is due to the fact that the plating layers were located at distinct positions in electrical field during the electrodeposited process. No iron oxide appears in these iron-nickel alloys which were placed in a chemical laboratory and exposed in air for 33 months. This indicates that the electrodeposited iron-nickel alloys have a high ability of corrosion resisting.