NiCoCuZn spinel ferrites were prepared by a low-temperature sintering procedure with adding different composite additives, Bi2O3-V2O5 and Bi2O3-PbO. The effect of different composite additives on their magnetic permeability dispersion behaviors was investigated. Results show that for the samples with Bi2O3-V2O5 additive, the grain size increases with increasing of the Bi2O3 content in the composite additive. The microstructure change results in variations of initial magnetic permeability values and cutoff frequencies. Their permeability dispersion behaviors are ascribed to the domain wall movement mechanism. However, for the samples with Bi2O3-PbO additive, the grain size decreases with increasing of the Bi2O3 content in the composite additive. Compared with samples with Bi2O3-V2O5 additive, their initial magnetic permeability values are smaller, but the cutoff frequencies are higher