Abstract: In the paper,KCl-CaCl₂-MgCl₂ ternary chloride molten salt（m（KCl）∶m（CaCl₂）∶m（MgCl₂）=25∶27∶48）)is used as the base salt,nano-ZnO particles with different particle sizes and mass fractions were added to prepare nano-ZnO/ternary chloride molten salt,and its thermal properties and corrosion characteristics were tested. The DSC test results show that addition of 1.0% 60 nm-ZnO has the greatest enhancement on the specific heat capacity of ternary chloride molten salt;The solid specific heat capacity is increased by 18.87%,and the liquid specific heat capacity is increased by 18.98% compared with the base salt;The melting point of nano-ZnO/ternary chloride molten salt is lower than that of base salt,and the latent heat of melting is increased;The crystal structure and micromorphology of nano-ZnO/ternary chloride molten salt were characterized by FT-IR,XRD and SEM. The corrosion characteristics of base salt and nano-ZnO/ternary chloride molten salt on three kinds of stainless steel were tested.