在温度 1 2 .1～ 60 .5℃范围内测定了地下卤水体系的饱和蒸汽压 ,并采用Clausius -Clapeyron方程进行关联 ,计算水活度 ;比较强电解质混合体系水活度的理论计算模型 ,探索计算地下卤水体系水活度的最佳方法 The saturation vapor pressure of the underground brine system was measured at a temperature range of 121-160.5 ℃ and the Clausius-Lappeneron equation was used to calculate the water activity. The theoretical calculation model of the water activity of the strong electrolyte system was compared. Explore the best method to calculate the water activity of underground brine system