The solubility of the salt and the density, electrical conductivity, and pH of ternary systems K2B4O7 + Li2B4O7 + H2O and Na2B4O7 + Li2B4O7 + H2O at T = 288 K were determined. On the basis of the experimental results, phase diagrams and property composition diagrams were derived. Phase equilibrium solids were Na(2)B(4)O(7)(.)10H(2)O, K(2)B(4)O(7)(.)4H(2)O, and Li(2)B(4)O(7)(.)3H(2)O. Analyses of what was made on the crystallization areas in the phase diagram were discussed. The results of properties in the solution were also discussed simply.