The solid-liquid equilibrium data of 4-formylbenzoic acid in four solvents was measured by the steady-state method It temperatures ranging horn (303.2 to 473.2) K. including ethanoic acid, water, and aqueous ethanoic acid with 0.8 and 0.9 mass fractions of ethanoic;acid, respectively. The solubility model modified from the Apelblat equation was used to correlate the experimental data. The average relative deviations of these correlations are 0.06 and 0.04 for solubilities in ethanoic acid and water at temperatures above 403.2 K. respectively, and no more than 0.03 for those in;igneous ethanoic acid.