The LHP uses the capillary head instead of the mechanical pump to transfer the fluid. It does not have any moving parts and transfer the fluid by the capillary head between the vapor and liquid interface of the wick like a heat pipe (HP). Moreover, vapor and liquid flows in the same direction. It can reduce the loss of the pressure in the wick (very short wick in the evaporator) and can transfer large heat over long distance compared with HP. It is necessary that we do the hazard analysis that is a part of the safety design, for the benefit of eliminating and inhibit the hazard. In this paper, we describe the hazard analysis of LHP.