In　this　study,　the　phase　diagram　of　the　NaCl+RbCl　binary　system　was　measured　using　differential　scanning　calorimetry,　and　the　measured　molar　percentages　of　the　binary　mixture　RbCl　ranged　from　12　to　97　mol%,　updating　and　extending　the　experimental　data　for　this　binary　system.　The　liquid　phase　of　this　system　was　thermodynamically　modeled　using　a　modified　quasichemical　model,　and　a　computer　optimization　program　for　evaluation　of　the　experimental　data　on　phase　equilibria　and　other　thermodynamic　data　was　developed　based　on　this　model.　All　thermodynamic　models　of　the　NaCl+RbCl　binary　system　were　constructed;　calculations　of　the　phase　diagram,　enthalpy　of　mixing,　and　activity　coefficient　of　NaCl　of　the　NaCl+RbCl　binary　system　were　completed　using　the　obtained　model　parameters;　and　the　calculated　eutectic　point　positions　were　x(RbCl)　=　0.567　and　550.2　degrees　C.　The　calculated　results　were　able　to　reproduce　the　various　types　of　experimental　data　well,　and　the　thermodynamic　self-consistency　between　different　types　of　experimental　data　was　demonstrated.