Abstract: Fe₃O₄ submicrometer hollow spheres were prepared by a simple hydrothermal route,and characterized by X-ray powder diffraction（XRD）spectra,fourier transform-infrared（FTIR）spectra,transmission electron microscopy（TEM）,field-emission scanning electron microscopy（FESEM） and vibrating sample magnetometer（VSM）.FTIR and XRD results reveal the state of matter and crystal structure of the as-prepared Fe₃O₄ particles.TEM and FESEM images show that the products have different shapes when the reaction condition is different.Magnetic hysteresis loop indicates that the as-prepared Fe₃O₄ hollow spheres exhibit a ferromagnetic behavior.