Low　cost　heat　charge　and　discharge　can　be　realized　by　immersion　arrangement　of　a　helically　coiled　heat　exchanger　in　molten　salt　single　storage　tank.　Heat　removal　modes　of　the　helically　coiled　heat　exchanger　will　directly　affect　the　heat　discharge　process　of　the　storage　system.　Simulations　were　performed　for　two　heat　removal　modes　which　include　upper-lower　path　and　lower-upper　path.　For　different　heat　removal　modes　in　the　heat　discharge　process,　the　law　of　heat　discharge　performance　of　the　molten　salt　single　storage　tank　is　given,　and　the　change　of　flow　field　of　molten　salt　side　is　analyzed.　The　results　show　that　upper-lower　path　for　the　helically　coiled　heat　exchanger　can　improve　the　transient　out　temperature,　transient　heat　transfer　rate　and　heat　discharge　efficiency.　The　research　results　provide　a　theoretical　basis　for　the　design　of　the　molten　salt　single　tank　heat　storage　and　discharge　system.　©　All　Right　Reserved.