Concentrating　Solar　Power　(CSP)　system　with　storage　can　provide　consistent　power　and　thus　are　attractive　relative　to　intermittent　power　sources,　e.g.,　solar　photovoltaics　and　wind.　Mixed　molten　salt　is　a　promising　medium　for　both　heat　transfer　and　energy　storage　in　solar　thermal　power　because　of　its　many　advantages　such　as　large　heat　capacity,　low　vapor　pressure,　low　cost,　wide　range　of　temperature　in　application,　etc.　However,　there　are　the　disadvantages　of　higher　melting　point　and　poor　thermal　stability　with　the　commonly　mixed　molten　salts,　such　as　Solar　salt　(60　wt%NaNO3+40　wt%KNO3,　melting　point　@220　degrees　C,　limit　use　of　temperature　@　565　degrees　C).　In　order　to　obtain　molten　salt　with　lower　melting　point　and　better　short-term　thermal　stability,　14　kinds　of　mixed　molten　salts　are　obtained　by　adjusting　the　component　ratio　and　adding　carbonates　or　nitrates　based　on　Solar　salt.　Through　the　Differential　Scanning　Calorimetry　(DSC)　and　Thermogravimetric　(TG)　methods,　their　melting　point,　crystallization　point,　thermal　decomposition　temperature　and　short-term　thermal　stability　are　measured.　4　kinds　of　mixed　molten　salts　are　selected　preliminarily　at　last.　Their　melting　points　and　decomposition　temperatures　are　about　100　degrees　C　and　600　degrees　C　respectively.　They　show　good　short-term　thermal　stability　in　the　4-days　repeated　heating-cooling　experiments.　The　specific　heat　and　sensible　thermal　storage　cost　of　preferred　molten　salts　were　also　obtained.