Abstract: The physicochemical properties of multicomponent systems are involved in all fields of chemistry and have received attention from various related areas such as minerals, metallurgy, material science, environment, biology, and agriculture. At present, the relevant data can be obtained by using two major calculation methods, namely, the first principle method and the empirical method. Though the former has achieved recent great progress, it is still a long way to offer practical data; while the latter has not received progress for almost half a century. Therefore, a new method that is theoretically reasonable and accurate in practical application is necessary to obtain practical and precise physicochemical data for ternary and multicomponent systems. In this paper, a new theoretical model is suggested based on its corresponding binary ones. The feasibility of this theoretical model is discussed in terms of both theoretical analysis and practical performance.