In　order　to　meet　the　requirements　of　high　temperature　solar　thermal　power　generation　better,　the　melting　point　of　mixed　carbonates　should　be　further　reduced.　Starting　with　ternary　carbonates,　we　modified　their　composition　ratios　and　added　NaNO3　or　NaOH　as　additives.　Their　new　melting　points,　initial　crystallization　points,　decomposition　temperatures,　specific　heats　and　thermal　stabilities　were　analyzed.　While　the　melting　points　of　the　mixed　nitrate/carbonate　salts　were　maintained　at　394.7　degrees　C,　the　melting　points　of　the　mixed　hydroxide/carbonate　salts　were　reduced　to　323.2　degrees　C.　Also　the　initial　crystallization　temperature　of　the　mixed　hydroxide/carbonate　salts　was　dependent　on　their　composition.　Among　the　hydroxide-mixed　molten　salts,　there　are　six　samples　with　lower　initial　crystallization　temperature.　The　decomposition　temperature　of　the　selected　six　samples　was　nearly　800　degrees　C.　Their　specific　heats　were　fitted　with　the　quadratic　polynomial　of　the　temperature　and　their　thermal　stability　was　shown　by　the　excellent　repeatability　of　five　heating　curves.　Only　the　very　first　heating　curves　showed　that　the　initial　measured　value　of　a　melting　point　was　higher　than　all　the　later　values　of　the　molten　salts　due　to　starting　with　the　powder.　Furthermore,　possible　issues　that　arise　with　the　addition　of　NaOH　are　discussed.　(c)　2014　Elsevier　B.V.　All　rights　reserved.