The solid state reaction process of nanocrystalline oxides Dy~1~- ~xSr~xCoO~3~-~y (x=0.6) was studied using the model of the solid state reaction kinetics. The results show that the solid state reaction was diffusion-controlled. The activation energy of solid state reaction was 120kJ.mol^-^1. The reaction rate constant was 0.302×10^-^6～4.50 ×10^-^6 at the temperature ranging from 823K to 973K. The particle size of nano-crystalline was 5-15nm. The nanocrystalline oxides Dy~0~. ~4Sr~0~.~6CoO~3~-~y were obtained at 700℃ due to surface and interface effect of nanocrystalline.

Key words: DOUBLE OXIDE, COBALT OXIDE, STRONTIUM OXIDE, DYSPROSIUM OXIDE, REACTION KINETICS, NANOPHASE MATERIALS