LiNO3/H2O had been reported as an alternative working fluid to approach the corrosion problem. The corrosion behavior of structural material carbon steel in its concentrated solution had been investigated at high temperature.[28, 29] Results indicated that the carbon steel corrosion in LiNO3 solution is much smaller than that in LiBr solution. Copper and aluminium, which have excellent heat-conducting property, are usually adopted as the heat exchanging materials in absorption heat pump. Because aluminium has the advantages of light quality and good economics, its corrosion behavior in concentrated LiNO3 solution at high temperature has been investigated in this pape