Abstract: W-type hexagonal ferrites were prepared by chemical coprecipitation method.The effect of Dy,Nd and Pr substitution on magnetic properties were analyzed.The results show that rare earth elements substitution can adjust hyperfine parameters magically.An obvious increase in natural resonance frequency and high frequency relaxation characteristics and a strong decrease of complex permittivity have been observed.Suitable Dy content is useful to obtain higher magnetic loss and lower electrical loss.Furthermore,the reflection loss of one-layer absorber with Dy-substituted ferrite was calculated.For the specimen of x=0.05,the maximal reflection loss is-52.34dB,and the bandwidth（with respect to-10dB reflection loss） is 7.9 GHz at a matching thickness of 2.6mm. The result indicates that Dy substitution is useful for thin and wideband ferrite absorber.