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In order to explore the magnetic moment rotation in nanocrystalline soft magnetic alloys under high-frequency sinusoidal excitation, based on G. Herzer’s stochastic anisotropy theory and symmetry principle, a three-dimensional model of nanocrystalline alloy was established, and a sinusoidal alternating magnetic field with a frequency <i>f</i> of 1 kHz to 10 kHz and an amplitude <i>H</i> of 0.1 T to 0.8 T was applied to the model. The magnetic moment movement in the magnetization process is investigated at the mesoscopic and macroscopic levels by defining the magnetic moment deflection velocity <i>ω</i> and magnetization rate <i>v</i>, respectively. The results show that <i>ω</i> is positively correlated with the alternating magnetic field <i>f</i> and <i>H</i>, and the increase of <i>f</i> has a particularly significant effect on <i>ω</i> growth compared with the increase of <i>H</i>. Then the function relation between <i>ω</i> and <i>f</i> and <i>H</i> is obtained by fitting. In which the coefficient of <i>f</i> is much larger than that of <i>H</i>, about 2.5 times that of <i>H</i>. Finally, the magnetization curve is measured by an AC measuring device, and the functional relations between <i>v</i> and the alternating magnetic fields <i>f</i> and <i>H</i> are obtained, in which the coefficient of <i>f</i> is much larger than that of <i>H</i>, about 2.75 times that of <i>H</i>. This value is approximately the same as that of the <i>ω</i> analysis, at the same time the relative error is only 9.1%.