This work reports the study concerning the structure and magnetic properties of undoped CeO_2 and Fe-doped CeO_2(Ce_(1-x) Fe_xO_2, 0.01 ≤ x ≤ 0.07) nanospheres with diameters of 100~200 nm prepared by hydrothermal method using polyvinylpyrrolidone(PVP) as surfactant. The prepared samples were studied by using X-ray diffraction(XRD), Raman spectroscopy, transmission electron microscopy(TEM), high-resolution transmission electron microscopy(HRTEM), X-ray absorption near-edge structure(XANES), and vibrating sample magnetometry(VSM). The XRD results showed that Fe-doped CeO_2 was single-phased with a cubic structure, and with Fe~(3+)successfully substituting in Ce~(4+) sites. Raman spectra showed a redshift of F_(2g) mode that caused by the Fe doping. The samples of both undoped CeO_2 and Fe-doped CeO_2 exhibited room temperature ferromagnetism, and the saturated magnetization(Ms) increased with increasing Fe content until x = 0.05, and then the samples displayed ferromagnetic loops as well as paramagnetic behavior. The roles of Ce~(3+) and Fe~(3+)spin electrons are discussed for the ferromagnetism in the Fe-doped CeO_2. This work reports the study concerning the structure and magnetic properties of undoped CeO_2 and Fe-doped CeO_2 (Ce_ (1-x) Fe_xO_2, 0.01≤x≤0.07) nanospheres with diameters of 100~200 nm prepared by hydrothermal method using polyvinylpyrrolidone The prepared samples were studied by using X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), X-ray absorption near- edge structure (XANES) , and vibrating sample magnetometry (VSM). The XRD results showed that Fe-doped CeO 2 was single-phased with a cubic structure, and with Fe ~ (3+) successfully substituting in Ce ~ (4+) sites. redshift of F_ (2g) mode that caused by the Fe doping. The samples of both undoped CeO_2 and Fe-doped CeO_2 exhibited room temperature ferromagnetism, and the saturated magnetization (Ms) increased with increasing Fe content until x = 0.05, and then the samples displayed ferromagnetic loops as The roles of Ce ~ (3+) and Fe ~ (3+) spin electrons are discussed for the ferromagnetism in the Fe-doped CeO_2.