Abstract: The internal friction of hydrogen at low temperature and the annealing effect on it have been studied in iron-nickel based metallic glasses using Bordoni-type apparatus. The result shows that the internal friction of hydrogen at low temperature is snoek-like relaxation and the abnormal modulus defect and the abnormal relaxation strengh have been observed. The model of enhancement of τ-type defect to snoek-like relaxation is proposed to explain the abnormal relaxation strengh.