The barium ferrite precursors gels were prepared with sol-gel process by using citric acid. The effect
of calcination temperature on its phase and the effect of multiple doping(Zr, Cu) on microwave absorbing properties were studied. The barium ferrite was synthesized at 1 200 for 1 h. The absorption properties of the ferrite could be improved by increasing doping content. The absorbing properties of the ferrite is the best,with reflection loss of -7. 81 dB at 10. 4 GHz when the content of copper and zirconium is 0. 8 (BaFe12-x(Cu0. 5Zr0. 5)x O19,x =0. 8).