Abstract: Oxalic acid effect on extraction of 99Mo,95Zr-95Nb with benzoinoxime-CHCl3 is investigated. The best condition of extraction yield of Mo and decontamination factor of 95Zr-95Nb are researched. The separation procedure of Mo extraction with benzoinoxime-CHCl3 in nitric acid solution is described. Mo isotopes can be separated from the feed solution of spent uranium element.