Thermodynamic properties of LiCl in mixed solvents composed of polyhydric alcohols and water are measured by using the potentiometric technique at 298.15 K. The polyhydric alcohols are 1,2-propanediol (PG), 1,2-ethahediol (EG), and 1,2,3-propanetriol (GL). Pitzer and extended Debye-Huckel equations are applied: to Correlate the experimental data. The mean activity coefficients, the osmotic coefficients; and the excess Gibbs free energies were calculated. Meanwhile, the standard free energy of transference from water to the mixtures, the standard solubility product, and the primary LiCl hydration number are also obtained.