In　order　to　get　the　operation　performance　a　low　melting-point　molten　salt,　named　as　Hts,　with　a　low　melting　point　of　86　and　an　upper　working　temperature　of　550　was　employed　as　the　heat　transfer　fluid　of　a　parabolic　trough　collector　and　then　stable　and　reliable　volume　flow　rate　of　molten　salt　in　piping　was　measured　via　a　high　temperature　supersonic　flow　meter,　which　was　calibrated　in　advance,　after　many　times　of　attempts　by　some　types　of　flow　meters.　Then　heat　loss　of　receivers　at　different　temperature　was　calculated　and　primary　operation　performance　of　the　parabolic　trough　collector　with　molten　salt　as　heat　transfer　fluid　was　concluded.　Based　on　a　lot　of　experiments　with　low　melting-point　molten　salt　as　heat　transfer　fluid,　problems　of　molten　salt　solidification　inside　piping　and　devices　and　problems　of　over　high　off-sun-time　energy　consumption　are　solved　which　reduces　the　total　and　further　increases　the　reliability　of　the　parabolic　trough　power　plants.　©,　2015,　Science　Press.　All　right　reserved.