In　order　to　evaluate　the　effect　of　nanoparticles　on　the　specific　heat　capacity　of　a　low-melting-point　eutectic　quaternary　nitrate　salt,　1.0　wt%　SiO2　nanoparticles　with　an　average　size　of　20　nm　was　doped　into　the　mixed　salt　Ca(NO3)(2).4H(2)O-KNO3-NaNO3-LiNO3.　A　mechanical　dispersion　mixer　was　developed　to　prepare　molten　salt　nanofluids.　The　effects　of　the　mixing　time　(15,　45,　90,　120,　and　150　min)　and　stirring　rate　(600,　750,　and　1000　min)　on　the　specific　heat　capacity　of　the　nanofluids　were　analyzed　using　a　differential　scanning　calorimeter.　The　results　showed　that　the　specific　heat　capacity　of　the　nanofluids　varied　with　the　mixing　time　and　stirring　rate.　It　increased　by　similar　to　17.0%　at　a　mixing　time　of　15　min　and　stirring　rate　of　750　rpm.　Microstrutural　characterization　of　the　molten　salt　nanocomposites　was　performed　using　scanning　electron　microscopy,　which　showed　that　special　nanostructures,　which　resemble　chain-like　nanostructures,　were　formed　on　the　surface　of　the　solid　nanofluids.　The　special　nanostructures　with　a　large　specific　surface　area　and　high　surface　energy　could　increase　the　specific　heat　capacity　of　the　molten　salt　nanofluids.