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Based on the coprecipitation of FeSO _4 (NH _4 ) _2 SO _4 with CuCl _2 and ZnSO _4 , CuFe _2 O _4 and ZnFe _2 O _4 nanocrystals were successfully synthesized. The morphology and the crystal structures of the nanoparticles were studied via SEM, TEM and XRD, which showed that MFe _2 O _4 samples were formed aggregated nanoparticles with crystal sizes of 16 ∼ 20 nm with a narrow dispersion in size. The samples had the typical spinel structures. Magnetic analyses demonstrated that the CuFe _2 O _4 sample had the saturation magnetization (Ms) of 10.10 emu g ^−1 with the coercivity of 92.18 Oe, while the ZnFe _2 O _4 sample had the Ms of 8.27 emu g ^−1 with the coercivity of 25.42 Oe at room temperature, respectively.