Abstract: TiO₂ nanopowders were modified through adding dopant material into precursor of liquid plasma spray.The powders were characterized by transmission electron microscopy (TEM), Xray diffraction (XRD)and X-ray photoelectron spectroscopy (XPS). The results showed that iron-doped TiO₂ nanopowders can be prepared by liquid plasma spray, the prepared powders is in the range of 10-35 nm with spherical shape or near spherical shape and the powders were composed of mixed crystal of anatase and rutile when iron content is less than 2.0%, Fe³⁺ accelerates the transition from rutile phase to anatase phase and Fe₂Ti₃O₉ is precipitated when iron content is 10.0%.The iron doping can not cause long range waving of average crystallite size of powders.There are O, Ti, Fe and C elements in the prepared powders and the valency of Fe element is still +3.