Solubility isotherms of the ternary Ca(NO3)(2)-LiNO3-H2O system were elab-orately determined at T = (273.15, 298.15, and 323.15 K) by an isothermal equilibrium method, and the results showed that there are two stable solubility branches for the solid phases Ca(NO3)(2)center dot 4H(2)O and LiNO3 center dot 3H(2)O at 273.15 K, and four stable solubility isotherms for the solid phases Ca(NO3)(2)center dot 4H(2)O, Ca(NO3)(2)center dot 3H(2)O, LiNO3 center dot 3H(2)O, and LiNO3 at 298.15 K, and solubility data corresponding to solid phases Ca(NO3)(2)center dot 3H(2)O, Ca(NO3)(2)center dot 2H(2)O, and LiNO3 at 323.15 K. The experimental data were correlated by a modified Brunauer-Emmett-Teller (BET) model, to obtain the complete phase diagram of the ternary system over the temperature range from 273 to 373 K. On the basis of the simulated polytherms, an eutectic point Ca(NO3)(2)center dot 4H(2)O + LiNO3 center dot 3H(2)O was recognized, and the melting temperature and fusion heat are 290.5 K and 139.8 J-g(-1), respectively, measured by differential scanning calorimetry.