提出一种半经验的关联-预测活度系数的系统.二元系的活度系数用—过量自由焓模型推算.该模型的模型参数从2个代数方程联立求解,其一关联模型参数与γ~∞,另一关联模型参数与(dγ/dx)_x=0.γ~∞用MOSCED模型由纯组分性质关联.(dγ/dx)x=0用三维溶解度参数关联.用该系统对145组等温极性二元系作了预测,对计算结果与实验值作了对比. A semi-empirical correlation-prediction activity coefficient system is proposed.The activity coefficient of the binary system is calculated by the excess free enthalpy model.The model parameters of the model are solved from two algebraic equations, and the correlation parameter (dγ / dx) x = 0 is related to (dγ / dx) x = 0 using the MOSCED model, 145 sets of isothermal polar binary system were predicted, the calculated results and experimental values ​​were compared.