In　order　to　improve　the　thermal　properties　of　molten　salts,　20　nm　silica　particles　were　dispersed　into　nitrates　by　ultrasonic　stirring　method　to　study　the　effects　of　different　mass　concentrations　of　nanoparticles　on　the　thermal　properties　of　nitrates.　The　specific　heat,　latent　heat,　and　decomposition　temperature　of　the　molten　salts　are　measured　by　a　synchronous　thermal　analyzer.　The　results　show　that　the　thermal　properties　of　molten　salt　varied　with　the　concentration　of　silica.　Compared　with　the　base　salts,　the　heat　of　fusion　improvements　of　the　solar　salt,　potassium　nitrate　and　sodium　nitrate　with　20　nm　SiO2　nanoparticles　were　found　to　be　similar　to　3.84%,　similar　to　9.16%　and　similar　to　3.31%;　and　the　specific　heat　increased　by　similar　to　15.89%,　similar　to　33.52%　and　similar　to　11.86　%　in　liquid,　respectively.　(C)　2019　The　Authors.　Published　by　Elsevier　Ltd.