Abstract: The spectrographic method is studied for determinating ~(235)U in the waste--liquidand waste--water containing uranium. Uranium is quickly separated froma sample with extractive chromatography technique. The uranium solution is dro-pped into a special shallow--cup graphitic electrode, and covered by a layer ofcopper powder, then it is excited by the arc light. The precision of this method is±0. 9%～±5. 6% for 3. 1%～50. 0% of ~(235)U, respectively, under the selected experi-mental conditions. The samples with ~(235)U abundance ranging from 7.0% to 50.0%can be determined using a non--standard sample method and the precision is ±0.3%to ±4. 9%.