Ni-Zn ferrite and Bi2O3 composites were developed by the sol-gel method.The structural,magnetic,and dielectric properties were studied for all the prepared samples.X-ray diffraction (XRD) was performed to study the crystal structure.The results of field emission scanning electron microscopy (FE-SEM) showed that the addition of Bi2O3 can increase the grain size of the Ni-Zn ferrite.Magnetic properties were analyzed by a hysteresis loop test and it was found that the saturation magnetization and coercivity decreased with the increase of Bi2O3 ratio.In addition,the dielectric properties of the Ni-Zn ferrite were also improved with the addition of Bi2O3.