Various preparation methods of nano-sized CeO_2 developed in recent years were summarized;the advantages and drawbacks of each method were discussed.The applications of CeO_2 nanoparticles in the high-tech domains such as abrasive for ultra-precision polishing,catalytic supports for automobile and electrode materials for solid oxide fuel cells were reviewed.Future research direction of CeO_2,should be particularly in improving powder characteristic,studying the mechanism of nucleation and growth by dynamic ...