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ObjectivernThe No. X03 lithium pegmatite vein in the Jiajika lithium deposit in west Sichuan is a newly discovered super-large vein which contains an identified reserves of 643, 100 tons Li2O. Lithium has two stable isotopes (6Li and 7Li), and 6Li is a key raw material for nuclear fusion. Significant fractionation of lithium isotopes is almost nonexistent during partial melting, crystallization differentiation and metamorphism, and lithium isotopes are thus often used as a tracer in geological studies of source areas and subduction zones. In this study, pegmatite engineering samples from the No. X03 vein were systematically determined for the first time. It is helpful to directly understand the distribution characteristics of lithium isotopes in the deposit and the source of pegmatite.