The structural change for mechanically alloyed Fe₅₀Al₅₀ powder in annealing process was studied by vibrating sample magnetometer (VSM) and ⁵⁷Fe Mossbauer spectroscopy method. The ferromagnetic components became extinct after mechanical alloying. The spectrum was fitted with 2 doublets on the mechanically alloyed powders. The integrated intensity of one doublet increased with annealing time while that of the other doublet decreased. It is considered that mechanically alloyed Fe₅₀Al₅₀ powder is constituted of two kinds of phases with different atomic configurations, which correspond to the ordered and the disordered structures. The ratio of the ordered FeAl phase and the disordered FeAI phase would be 4:6 in the mechanically alloyed powder. And first component increased by annealing at 673 K.