The Mossbauer spectra of amorphous Fe_B_x (14≤x≤21) alloys which are slightly asymmetric are analyzed in terms of the distributions of hyperfine fields and isomer shifts. On the assumption that the correlation between hyperfine fields H and isomer shifts I. S. is described by I. S.=c_0+c_1・H, where c_0 and c_1 are constants, the value of c_1 is dependent upon the concentration as same as c_0. While the change of c_0 is connected smoothly to the isomer shifts of crystalline α-Fe, Fe_2B and FeB, the value of c_1 which explains the asymmetry is sensitive to the amorphous structure
