Laser aided additive manufacturing (LAAM) was used to prepare FeCrNiMnCo high entropy alloy (HEA) with pre-alloyed powders. The microstructure and properties of the HEA were investigated intensively, especially the cryogenic mechanical properties. The microstructure of the as deposited specimen was dense and occupied by cellular and dendrite grains. The tensile strength and yield strength increased with temperature decreasing from 25°C to -130 °C, yet the impact toughness decreased. The deformation mechanism of the HEA under low temperature was discussed accordingly.