As　the　heat　transfer　and　storage　medium,　the　molten　salts　have　the　good　prospect　in　the　high-temperature　solar　thermal　power　technology.　The　viscosity,　density,　specific　heat　and　thermal　conductivity　are　closely　related　to　the　heat　transfer　process　of　molten　salts.　In　this　paper,　the　errors　of　every　thermophysical　property　that　causes　the　heat　transfer　performance　to　deviate　at　+10%　or　-10%　were　calculated　under　a　variety　of　classic　heat　exchange　equations,　respectively,　according　to　the　function　error　theory.　Using　the　error　analysis　method,　the　influence　of　thermophysical　properties　data　on　the　heat　transfer　performance　calculation　of　molten　salts　was　obtained.