In this work, the structures of the amorphous alloys Fe5Co70Si15B10,Fe78Si1OB12 and Fe80B20 were analysed by X-ray diffraction method. From the diffraction intensity data the structure factors and radial distribution functions (RDF) of these materials were calculated.In order to obtain partial radial distribution functions (PRDF) of the binary alloy Fe80B20, the first peak of the alloy was fitted using a sum of two Gauss type functions. One of them describes the PRDF of the Fe-Fe atom pair, and the other describes the PRDF of the Fe-B atom pair.As the results of fitting, the average number of nearest neighbor atoms and most probable distance between two atoms were determined for each kind of atom pair. The curves of PRDF and the values of those parameters agree satisfactorily with the results obtained by other author using anomalous X-ray diffraction technique.