Abstract: Carbon nanotubes(CNT) with plenty of oxygen containing functional groups were successfully prepared by the ozone oxidation method. The contents of oxygen containing functional groups in the samples were determined by organic element analysis, XPS element analysis and the Boehm titration. The special surface area, pore volume and pore diameter were measured. Results show that the contents of oxygen containing functional groups increase 3-7 times after modification. This ozone modification technique is significantly influenced by temperature. The adsorption performance of the modified CNT for uranium from aqueous solutions was investigated, and the optimum adsorption conditions were obtained. Results show that CNT without modification has poor adsorption efficiency, and the maximum removal rate of uranium is only 78.0%. The adsorption property of the modified CNT is significantly improved due to the increasing contents of oxygen containing functional groups, and the maximum removal rate of uranium is up to above 95.0%.