Molten　salt　nanofluids　has　been　extensively　considered　for　Thermal　Energy　Storage　(TES)　applications　due　to　its　enhanced　heat　storage　and　heat　transfer　properties.　The　compatibility　between　molten　salt　nanofluids　and　metal　materials　becomes　a　key　issue　affecting　their　application　in　TES　systems.　In　this　paper,　corrosion　tests　were　carried　out　on　316　L　stainless　steel　in　quaternary　nitrate　molten　salt　at　565　C-degrees　using　electrochemical　methods　including　impedance　spectroscopy　and　potentiodynamic　polarization　to　determine　the　effect　of　the　addition　of　nanoparticles　to　the　molten　salt　corrosion　process.　The　results　showed　that　the　addition　of　nanoparticles　reduced　the　corrosion　current　density　of　316　L　stainless　steel　in　quaternary　mixed　molten　salt.　The　corrosion　current　density　of　316　L　stainless　steel　in　molten　salt　nanofluids　with　SiO(2　)and　TiO2　was　reduced　to　0.636　mA/cm(2)　and　0.749　mA/cm(2),　respectively.　And　the　EIS　results　showed　that　the　impedance　value　of　316　L　stainless　steel　in　molten　salt　nanofluids　was　significantly　larger　than　that　in　base　salt.　The　addition　of　nanoparticles　to　the　molten　salt　slowed　down　the　ionic　transport　of　316　L　stainless　steel　in　the　molten　salt　and　the　formation　of　reticulated　and　acicular　nanostructures　enhanced　the　corrosion　resistance　of　the　stainless　steel　oxide　layer.　Therefore,　the　presence　of　nanoparticles　reduces　the　corrosion　of　molten　salt　on　stainless　steel.