NiFe2O4 powders with double skin structure which shows a length of 5 ?m and curved surface thickness of 0.5 ?m were prepared by thermal decomposition of their oxalate precursors. The NiFe2O4 powders were mixed uniformly with a proportion of paraffin and then pressed to composite samples. The 采用草酸盐沉淀法制备草酸铁镍前驱体，热分解得到长5 ?m、曲面厚0.5 ?m的夹层中空结构NiFe2O4粉末，将其与石蜡按一定比例混合均匀压制得NiFe2O4/石蜡复合物，考察了其电磁参数，计算了其吸波性能. 结果表明，NiFe2O4含量为40%(?)时复合物吸波性能最佳，样品厚度为3.5 mm时，材料在6.66 GHz处反射损失最小，为?52.06 dB，厚度为3.0 mm时，材料在6.98?8.59及9.72?10.84 GHz范围内反射损耗小于?10 dB，有效吸收频宽为2.73 GHz.

NiFe2O4 powders with double skin structure which shows a length of 5 ?m and curved surface thickness of 0.5 ?m were prepared by thermal decomposition of their oxalate precursors. The NiFe2O4 powders were mixed uniformly with a proportion of paraffin and then pressed to composite samples. The electromagnetic parameters of NiFe2O4/paraffin composites with different NiFe2O4 contents were measured by a network analyzer, and the reflection losses were calculated by transmission line theory. The results showed that the 40%(?) NiFe2O4/paraffin composite has the best absorbing property. The minimum reflection loss reaches ?52.06 dB with a sample thickness of 3.5 mm at 6.66 GHz. The effective frequency band of reflection loss less than ?10 dB is 2.73 GHz (6.98?8.59 and 9.72?10.84 GHz) for the sample with a thickness of 3.0 mm.