本文提出了一个由二元系推算三元系热力学性质的新模型，此模型能自动用热力学准则来检查各二元系的对称性，并根据不对称程度来构筑权重函数，由于不需要事先选择不对称组元，消除了计算过程中的人为干扰．此模型逐点比较二元系的相似性，当体系中有的二元系模型仅在局部浓度范围有效时，仍能合理地运用，和目前已有的一般化几何模型相比，此模型的适用范围有所拓宽． In this paper, we propose a new model for predicting the thermodynamic properties of ternary systems from the binary system. This model can automatically check the symmetry of the binary systems with thermodynamic criteria and construct the weighting function based on the degree of asymmetry. Since no prior selection is needed Asymmetric components, eliminating the calculation of man-made interference. This model compares the similarity of binary systems point by point. When some binary systems in the system are valid only in the local concentration range, the model can still be used reasonably. Compared with the existing generalized geometric models, The scope of application has been broadened.