Concentrated solar thermal power generation is becoming a very attractive renewable energy production system among all the different renewable options, as it has have a better potential for dispatchability. Thus, of all components, thermal storage is a key one. However, it is also one of the less developed. The appropriate heat transfer fluid and storage medium is a key technological issue for the future success of solar thermal technologies. Molten salt as the most promising thermal energy storage medium in large-scale industrial application, the method which can improve the thermal storage ability should be proposed. But studies on this area are rare.This study will lay a foundation for the application of gold nanoparticles in molten salt which can remarkably improve the thermodynamic property. Thermal analysis methods and scanning electron microscope (SEM) are utilized to provide a review of the gold-salt composite materials microstructure.