With the isothermal dissolution equilibrium method and wet-residue method, the solubility data as well as physicochemical properties including density, refractive index, and pH value of the two ternary systems (NaCl + NaBO2 + H2O) and (Na2SO4 + NaBO2 + H2O) at 298.15 K and 0.1 MPa have been experimentally determined, and the relatively phase diagrams have been established for the first time. In the ternary system (NaCl + NaBO2 + H2O), two invariant points, three univariant curves, and three crystallization regions corresponding to sodium chloride (NaCl), sodium metaborate tetrahydrate (NaBO2 center dot 4H(2)O), and a congruent double salt teepleite (NaCl center dot NaBO2 center dot 2H(2)O) were detected. While in the ternary system (Na2SO4 + NaBO2 + H2O), there are one invariant point, two univariant curves, and two crystallization regions corresponding to NaBO2 center dot 4H(2)O and mirabilite (Na2SO4 center dot 10H(2)O). The physicochemical properties (density, refractive index, and pH value) in the two systems present a regular variation versus that with the changes of sodium metaborate concentration in the solution. Moreover, on the basis their empirical equations, the calculated values of refractive index and density are consistent with the experimental data.