Abstract: Principle and characteristics of hydrothermal method were briefly introduced. Characteristics and present  situ-ation of hydrothermal methods,including hydrothermal-crystallization,oxidation,reduction,precipitation, decomposition,and synthesis-methods,of nano-oxides were reviewed.Research progress in combination of hydrothermal method with other synthetic methods,such as microwave-hydrothermal,microemulsion-hydrothermal,and sol（gel）-hydrothermal,which were applied in preparation of nano-oxides were also discussed.At last,preparation of nano-oxides by hydrothermal method was also prospected.