Nitrate　molten　salts　are　extensively　applied　in　Concentrating　Solar　Power　plant　as　high-temperature　thermal　energy　storage　and　heat　transfer　medium.　At　present,　the　study　on　molten　salt-based　nanofluids　(MSBNFs)　mainly　focuses　on　the　physical　properties,　such　as　thermal　conductivity,　specific　heat,　viscosity.　There　is　rare　research　on　forced　convection　heat　transfer　performance　of　MSBNFs.　In　this　study,　the　heat　transfer　characteristic　of　low　melting　point　quaternary　MSBNFs　in　circular　tube　with/without　different　twisted　tapes　are　investigated.　The　results　show　the　Nu　number　increases　with　the　decreasing　of　twisted　tape　twisted　ratio.　Compared　with　the　smooth　tube,　the　average　Nu　numbers　of　MSBNFs　in　tube　inserted　with　twisted　tape　Y-1,　Y-2,　Y-3　increase　14.93%,　20.67%,　25.49%,　respectively.　The　secondary　flow　contours　by　inserting　twisted　tape　in　tube　increases　with　the　decreasing　of　twisted　ratio　and　reduce　the　temperature　boundary　layer.　The　temperature　distribution　in　tube　with　twisted　tape　is　more　uniform　compared　with　that　in　smooth　tube.　The　heat　transfer　correlation　of　low　melting　point　MSBNFs　in　tube　inserted　with　different　twisted　tapes　is　fitted.　The　heat　transfer　performance　of　low　melting　point　MSBNFs　is　compared　with　different　convection　heat　transfer　empirical　correlations　in　this　work.