Ferrite/carbon composite powder was prepared by hydrothermal reaction of glucose solution and Ba- Zn2Fe16O27 powder synthesized by the solid-state method. The XRD, SEM were used to analyze the structure and the morphology of the composite powder. The vector network analyzer were used to test the electromagnetic performance of the composite absorbent at different hydrothermal reaction temperatures. The results showed that glucose was carbonized after hydrothermal reaction, and grafted on the surface of flake ferrite. The ferrite/ carbon micro-nano composite absorbent was obtained. At the frequency range from 2 to 18GHz, compared with single ferrite, the magnetic loss of composite materials was slightly increased, but the dielectric loss was obviously increased. When the hydrothermal reaction temperature was 160℃, the dielectric loss reached the maximum, and there were dielectric loss peaks and magnetic loss peaks in many places, it was beneficial to the absorption of electromagnetic wave, moreover, the absorbing band of microwave was broadened, the amount of absorbent was reduced, and the absorption effect was further increased.%采用固相法制备BaZn2Fe16O27铁氧体，将其与葡萄糖溶液混合水热反应，得到铁氧体／碳复合粉体。通过XRD、SEM等表征手段，研究了复合粉体的物相组成、显微结构，并用网络分析仪分析了不同水热反应温度下复合粉体的电磁特性。结果表明，葡萄糖在水热反应后发生碳化，接枝在片状铁氧体表面，得到了铁氧体／碳复合吸收剂；与单一的铁氧体相比，在2～18GHZ频段内，复合粉体的磁损耗有所增加，介电损耗明显增加；在水热反应温度为160℃时，复合粉体的介电损耗值达到最大，介电损耗和磁损耗在2～18GHZ频段内出现多个损耗峰，有利于电磁波的吸收，并且拓宽了吸波频带，增加了其电磁性能，使得吸波效果进一步增加。
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