In order to provide thermodynamic data for mixed dibasic acid separation technology, the solubilities of adipic acid (AA) and succinic acid (SA) in glutaric acid (GA) + acetone mixture and GA + n-butanol mixture were measured by dynamic method at atmospheric pressure. The mass fraction of GA (wGA) ranged from (0 to 30.11) %. The results show that solubilities of AA and SA in acetone or n-butanol increased with increasing mass fraction of GA in the mixed solvent GA and acetone (or n-butanol) at the same temperature. The ideal solution equation, Apelblat equation, and lambda h equation were applied to correlation of the experimental solubility data, which were all in good agreement with the three equations. The Apelblat equation is regarded as the best one of the three equations for describing the dissolving of two acids in solvent at the same time.