High　temperature　molten　salt,　as　an　efficient　material　of　heat　transfer　and　heat　storage,　the　melting　point　and　fusion　latent　heat　determine　its　working　temperature　and　phase　change　heat　storage　capacity,　respectively.　The　quadbromide　salt　mixture　is　prepared　by　four　kinds　of　chemically　pure　salts　which　are　NaBr,　KBr,　CaBr2　and　LiBr　with　a　determined　proportion.　In　order　to　improve　the　thermal　performance　of　the　quad-bromide　salts,　nano-SiO2　is　added　to　the　quad-bromide　salts　and　so　new　kinds　of　nano-SiO2　bromide　salts　are　prepared　with　different　mass　fractions　of　nano-SiO2.　Then　the　method　of　Simultaneous　Thermal　Analysis(STA)is　used　to　investigate　variations　of　melting　point　and　fusion　latent　heat　of　the　nano-bromide　salts　with　different　ratios　of　nano-SiO2.　The　experimental　results　show　that　melting　point　of　nano-bromide　salts　decreases　slow　with　the　increase　of　the　mass　fraction　of　nano-SiO2,　the　fall　range　is　within　2.5.　The　fusion　latent　heat　of　the　nano-bromide　salts　increases　linearly　with　the　increase　of　mass　fraction　of　SiO2,　when　the　mass　fraction　of　nano-SiO2　reaches　1.5%,　the　fusion　latent　heat　of　nano-SiO2　bromide　salts　mixture　reaches　maximum,　increased　89.6　%　compared　with　the　quad-bromide　salts　mixture.　The　decomposition　temperature　and　thermal　stability　of　the　quad-bromide　salts　mixture　are　improved　by　the　addition　of　nano-SiO2.　©　2017,　Editorial　Board　of　Acta　Energiae　Solaris　Sinica.　All　right　reserved.