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Under diflerent magnetic field intensities, the dependence of the permeabilityμ on temperature T(μ-T curve) for the Fe73.5Cu1Nb3Si13.5B9 alloy annealed at 350～620℃ was investigated. The results showed that the magnetic field intensity had a remarkable influence on the shape ofμ-T curves. For amorphous alloy, the sharp Hopkinson peak of μ-T curve disappeared gradually with the increase of magnetic field intensity.