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The nanocrystalline Fe0.13(CoxNi100−x)0.87 (x = 30, 50, and 80) alloy fiber 50 wt%–epoxy resin composites were prepared by mixing epoxy resin with the alloy fibers. The electromagnetic parameters of the composites were measured using the coaxial line method and the reflection loss was calculated at a frequency range 1–18 GHz. The results show that the nanocrystalline Fe0.13(CoxNi100−x)0.87 alloy fiber–epoxy resin composites have effective microwave absorption characteristics in radar band, which are mainly influenced by the nanocrystalline alloy composition and the composite thickness. This microwave absorption effect largely arises from the eddy current, ferromagnetic resonance, and dielectric loss in the composite. [ABSTRACT FROM AUTHOR]