In　order　to　improve　the　thermal　physical　properties　of　ternary　carbonates,　potassium,　lithium,　and　sodium　carbonates　were　modified　by　adding　additives　CaO,　CaCO3,　Ca(OH)(2)　and　KOH.　Their　melting　point,　initial　crystallization　point,　and　decomposition　temperature　were　analyzed　by　using　the　Synchronous　Thermal　Analyzer.　Although　the　additives　have　less　influence　on　the　initial　crystallization　temperatures　and　the　decomposition　temperatures　of　ternary　carbonates,　they　have　different　effects　on　the　melting　point　of　ternary　carbonates.　For　concentrating　solar　power,　KOH　could　be　a　good　candidate　of　practical　additive　to　expand　the　work　temperature　range　of　ternary　carbonates　by　reducing　melting　point　in　a　great　extent.　(C)　2015　The　Authors.　Published　by　Elsevier　Ltd.