Mixed　molten　salt,　with　large　heat　capacity,　low　cost,　low　vapor　pressure,　low　viscosity,　wide　using　temperature　range　and　so　on,　has　become　recognized　as　a　considerable　regenerative　potential　of　the　heat　transfer　medium.　36　kinds　of　mixed　carbonate　molten　salts　were　prepared　by　mixing　potassium　carbonate,　lithium　carbonate,　sodium　carbonate　in　accordance　with　different　proportions.　The　melting　point,　decomposition　temperature,　and　specific　heat　are　measured　by　the　analysis　of　the　TGA　and　DSC　curves.　In　addition,　the　fitting　curves　of　specific　heat　are　obtained.　The　results　show　that　melting　points　of　major　ternary　carbonate　are　close　at　around　400°C　and　decomposition　temperatures　of　most　ternary　carbonate　are　800-850°C.　Decomposition　temperatures　of　some　ternary　carbonate　are　900°C.　During　the　measurement,　it　is　necessary　to　pay　attention　to　the　phenomenon　of　segregation　of　some　components　in　the　cooling　process.　The　specific　heats　of　most　carbonates　fitted　with　quartic　polynomial　of　temperature　very　well.　©　All　Rights　Reserved.