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Ba1-xDyxCo2Fe16O27 (x =0.00,0.05,0.10,0.15,and 0.20) was prepared by the solid-state method.The phase structure was studied using powder X-ray diffraction (XRD),the electromagnetic properties were measured,and the reflection loss of Dy3+-doped ferrite material was calculated using electromagnetic parameters by the transmission line theory.All XRD patts showed the single phase of the magnetoplumbite barium ferrite without other intermediate phase when x ≤ 0.15.The values of ε′ and ε″ increased slightly with Dy3+ ions doping.The values ofμ″ andμ′ were improved with Dy3+ doping,exhibiting excellent microwave magnetic performance.The reasons have also been discussed using the electromagnetic theory.Dy substitution could increase microwave-absorbing performance and broaden frequency band (reflection loss (RL) ＜ -10 dB),and the absorbing peak shifted to high-frequency position.When x =0.2,ferrite layer exhibited the most excellent microwave-absorbing performance at a thin matching thickness of 1.5 mm.The peak value of RL was around -15 dB,and the frequency band (RL ＜ -10 dB) was about 7 GHz (from 8 to 15 GHz).