Ternary　carbonates　with　a　relative　low　melting　point　and　a　high　operating　temperature　is　one　of　the　promising　heat　transfer　fluids　for　Concentrated　Solar　Power　(CSP).　In　the　present　work,　ternary　carbonates　nanofluids　of　K2CO3-Li2CO3-Na2CO3　(4:4:2,　mass　ratio)　with　nanoparticles　were　prepared　by　using　a　two　step　solution　method.　The　specific　heat　capacity　of　ternary　carbonates　nanofluids　with　different　nanoparticles　(SiO2,　CuO,　TiO2,　Al2O3)　or　SiO2　with　different　size　(5,　20,　30,　60　nm)　were　investigated.　The　results　show　that　SiO2　nanoparticles　are　the　most　effective　additive　among　of　the　chosen　nanoparticles　in　enhancing　the　specific　heat　capacity　of　ternary　carbonates.　The　enhancement　of　specific　heat　capacity　of　ternary　carbonates　is　78.0-116.8%　in　the　range　of　500-540　degrees　C　when　adding　SiO2　in　the　range　of　5-30　nm.　The　enhancement　of　specific　heat　capacity　of　ternary　carbonates　nanofluids　with　CuO,　TiO2　and　Al2O3　are　50.6-73.9%,　31.1-56.5%　and　50.6-66.5%　in　the　range　of　500-540　degrees　C,　respectively.　It　is　proved　that　there　is　no　chemical　reactions　between　ternary　carbonates　and　the　added　nanoparticles.　The　difference　in　the　enhanced　specific　heat　capacity　is　mainly　depended　on　the　dispersive　state　of　nanoparticles　and　the　resulting　amount　of　needle-like　nanostructures　in　ternary　carbonates　nanofluids.