Abstract: ZnO nanoparticles were synthesized by one -step hydrothermal method.Transmission electron microscope（TEM ） and powder X-ray diffraction（XRD ） were used for characterization and evaluation of the morphology and particle size of products.The adsorption characteristic of copper（II） on ZnO nanoparticles were investigated by determination with graphite furnace atomic absorption spectrometry （GFAAS）.The results showed that the structure of the ZnO nanoparticles is hexagonal zincite,and the average particle diameter is 40 nm.When the pH is 5.0,the adsorption rate and adsorption capacity of ZnO nanoparticles toward copper（Ⅱ） was found to be 98.1%and 13.85 mg/g,respectively.