Abstract: The diffusion of hydrogen in amorphous NiCrFeSiB alloy has been studied by electrochemicalmethod. In the temperature range of 20~50℃, diffusion coefficient of hydrogen in the alloy fol-lows the equation' D(cm2/s)= 9.27x10-8exp(-53.4 kJ/RT). At room temperature the diffusion.coefficient D and the solubility Co are 6.125x 10-12 cm2/s and 0.007 mol/cm3, respectively.When As2O3 is added into the cathodic solution or the charging current density is increased, thediffusion coefficient and solubility increase, and the difFusion activation energy decreases. Theinfluence of amorphous structure on diffusion and solution of hydrogen is discussed.