With advanced electro-manufacture developing so fast,glass substrate as a kind of widely used material in the mechanical manufacture is forced to be ultra-smooth.Nano-sized CeO_2 was prepared by sol-gel method and characterized by X-ray diffraction and TOF-SIMS.It shows that the average particle diameter is 13.3nm and particle size distribution is uniform.The polishing performances of nano-sized CeO_2 on glass substrate were studied.ZYGO profiler indicated that the average roughness(Ra) of the surface was r...