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In search of a suitable ion exchange method for the enrichment of Li·isotopes, column elutions of Li-band have been examined under various conditions. For long distance displacement of the Li-band, BaAc 2 and CaAc 2 were found excellent for eluant, and the Li proved to be very well retained by hydrogen bed with Dowex 50 W-X 12, 50~100 mesh. From the standpoint of resin utilization and regenerant efficiency in cyclic column operation, CaAc 2 is preferable to BaAc 2 • Enrichment experiments were carried out with Li·isotopes, using the above exchange systems, which proved that 7 Li and 6 Li were well concentrateu in the respective ends of the Li-adsorption band. In one run, the 7 Li and 6 Li were enriched to 97.09 and 14.64% respectively in the front and rear edges of the band.