Ternary　carbonates　can　be　used　as　high　temperature　thermal　energy　storage　materials　in　concentrated　solar　power　plant.　To　improve　the　thermal　properties,　the　ternary　carbonates　(K2CO3:　Li2CO3:　Na2CO3　=4:4:2,　mass　ratio)　nanofluids　with　different　concentration　(0.25,　0.5,　1.0,　1.5,　2.0　wt.%)　of　SiO2　nanoparticles　were　prepared　in　the　present　work.　The　specific　heat　capacity　and　thermal　diffusivity　of　nanofluids　were　measured　by　using　differential　scanning　calorimeter　(DSC)　and　laser　flash　apparatus　(LFA),　respectively.　When　the　SiO2　nanoparticles　concentration　is　1.0　wt.%,　the　specific　heat　capacity　and　thermal　diffusivity　of　ternary　carbonates　can　be　enhanced　by　79.9-113.7%　and　16.3-25.9%　in　the　range　of　500-540°C,　respectively.　Subsequently,　the　calculated　thermal　conductivity　of　ternary　carbonates　can　be　increased　by　128-156.7%.　Based　on　the　characterization　of　scanning　electron　microscopy　(SEM),　the　needlelike　structures　with　large　specific　surface　area　can　be　found　in　ternary　carbonates　nanofluids,　which　can　provide　a　preferential　path　for　heat　transfer　and　help　to　improve　the　thermal　properties　of　ternary　carbonates　nanofluids.　©　2018　International　Heat　Transfer　Conference.　All　rights　reserved.