The 0.1mol·L-1CuSO4 liquor and 4mol·L-1NaOH liquor were prepared by CuSO4·5H2O and NaOH as raw materials.The difform nano-CuO were prepared by hydrothermal decomposition method.The Fig.1(a) was TEM photograph of CuO nano-ball,diameter was 20-80 nm.The reaction conditions were: the dropping rate of NaOH solution was 50 ml·min-1, the reaction temperature was 80℃, the pH value ofthe reaction end was 7,and the stirring rate was 100 r·min-1.