Abstract: The antimony-doped tin oxide nano-powders (ATO) have been prepared by complexing-homogeneous precipitation method with SnCl↓4·5H↓2O and SbCl↓3 as the raw materials，citric acid as the complexing agent，and carbamide as homogeneous precipitator.The prepared powders were characterized by means of differential thermal analysis，infrared spectrometry，X-ray diffraction (XRD)，transmission electron microscope and BET.Results showed that the prepared ATO nano-powders have the same rutile lattice structure as well as perfect crystallization.From the calculation of XRD，the average size of the particles is about 9.8 nm.TEM indicated that the particles are weakly agglomerated，the size of particles is about 12 nm，and the surface area gets up to 65.2 m2/g.ATO nano-sized powders with small particle size，large specific surface area and low agglomeration can be obtained by complexing-homogeneous precipitation method. <DIV>Key words：</DIV>