A modified synthetic method with a high definition visual camera technique for measuring the solubility of solutes in solvents or mixed solvents was proposed. To verify the reliability of the experimental apparatus, the solubility of NH4Cl in water was determined at different temperatures. The relative standard errors were less than 1%, compared to the literature data. The solubilities of betulonic acid in six organic solvents from (278.15 to 313.15) K were measured and correlated with the Apelblat equation and universal quasichemical equation, respectively. The modified method was quite concise and user-friendly, and made the process of dissolution to become visualized and automatic.