Abstract: A binary mixture solar salt was used as a working fluid to experimentally study the heat transfer characteristics of molten salt and subcritical steam/water in a tube-shell heat exchanger. The sensitivity of flow,inlet temperature,pressure and other parameters on pipe side and shell side to the heat transfer of molten salt flow was studied. The experimental results show that the molten salt inlet temperature has a greater influence on the heat transfer law. Based on the experimental data and the multivariate linear fitting method,the heat transfer correlation between molten salt and subcritical water or steam across the tube bundle is proposed. The maximum fitting errors are ± 10%,-15%,respectively.