Abstract: Loss of Zn²⁺ ions will significantly appear if the NiZnCu powders with NaOH or Ammonia as precipitant are prepared by chemical co-precipitation method.Therefore,the Ni_0.4-xZn_0.6Cu_xFe₂O₄（x=0,0.05,0.10,0.15,0.20） ferrite powders with Na₂CO₃ as precipitant were prepared in this study.And the structure and magnetic properties of the ferrite powders were researched.It was found that the precursor powder was formed as single-phase ferrite powder in the conditions of calcination temperature at 900℃ for 2 hours.Saturation magnetization Ms and coercivity Hc of the samples decreased with Cu content increasing.Initial magnetic susceptibility χ_i firstly increased and then decreased,and reached the maximum value when x=0.10.Research shows that the best Cu amount（x） is about 0.10.