Abstract: The oleic acid was used to modify the surface of nano-Cu₂O. The modified nano-Cu₂O was characterized by FT-IR,TEM,TG-DTA,the contact angle meter and spectrophotometer. The results of FTIR show that nano-Cu₂O modified by oleic acid can effectively restrain the agglomeration of the nanoparticles; the results of contact angle measurements show that along with the increasing of addition of oleic acid,the contact angle increases; the dispersive properties of nano-Cu₂O had been investigated by the spectrophotometer and transmission electron microscope,whose results indicate that the addition of oleic acid can significantly improve the dispersibility and the absorbance ability of nano-Cu₂O.