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The purpose of this study is to predict two-electrolyte solutions containing Rb+, explore its characteristics to better solve the problems existing in the natural environment, and promote the development of high technology. We fit and predict the activity and osmotic coefficients of nineteen single-electrolyte solutions and seven two-electrolyte solutions containing Rb+ using the electrolytr Molecular Interaction Volume Model and the electrolyte Molecular Interaction Volume Model-Energy Termmodels. The average relative errors of the activity coefficient and osmotic coefficient calculated by eMIVM in aqueous monoelectrolyte solution were 0.59% and 0.38%, respectively, and for eMIVM-ET they were 1.06% and 0.38%, respectively. The average relative errors of activity coefficient and osmotic coefficient calculated by eMIVM-ET in organic single-electrolyte solution were 1.33% and 0.48%, respectively, while for eMIVM they were 1.49% and 0.48%, respectively. When predicting the activity coefficient and osmotic coefficient of two-electrolyte solutions containing Rb+, the average relative errors calculated by the eMIVM-ET model were 23% and 13%, respectively, while the values calculated by the eMIVM model were 34% and 17%, respectively. The results show that eMIVM-ET has a good fitting effect in organic monoelectrolyte solutions, and eMIVM has a good fitting effect in aqueous monoelectrolyte solutions. In the prediction of two-electrolyte solutions, the eMIVM-ET model performs better than the eMIVM model. [ABSTRACT FROM AUTHOR]