We determined the lithium abundance іп the atmospheres of three carbon stars from resonanse doublet Li I λ 670.8 nm using fits of synthetic spectra to the observed spectra іп the region λλ 668—674 nm. We calculated synthetic spectra with the use of the modified atomic line list from the VALD database and of three variants of CN and C2 line lists, which are modifications of lists from Jorgensen’s site (http://stella.nb.dk) and from Kurucz’s database (1993, CD-ROM NN 1—23). These line lists were tested by fitting synthetic spectra to the observed spectra of the Sun, Arcturus and the early R star HD 100764. The blends included doublet Li I λ 670.8 nm were analysed іп the spectra of two N stars, AW Cyg and UX Dra. We estimated logN(Li) ≈ 2, -1.4, and -0.9 for HD 100764, AW Cyg, and UX Dra, respectively. Distinctions іп estimations of lithium abundance logN(Li) for the used molecular line lists do not exceed 0.2 dex.