Abstract: P92 heat resistant steel, 304 and 316L stainless steels, and TMS75 nickel-based alloy were immerged in supercritical NaCl aqueous solution through the coupon test, and the corrosion behaviors of them were analyzed by morphology, phase and chemical compositions of the corresponding oxide films. The results show that P92 heat resistant steel had the maximum corrosion rate of 20.37 mm·a-1, while the corrosion rates of 304 and 316L stainless steels were 6.27 mm·a-1 and 2.74 mm·a-1, respectively. In contrast, TMS75 nickel-based alloy had the minimum corrosion rate of 0.67 mm·a-1. Some big block oxide scales were observed on the oxide film surface of P92 heat resistant steel, and an oxide layer with a thickness of 320 μm was found on the top of it. There were a small amount of oxide scales on the surfaces of 304 and 316L stainless steels, no oxide film was found at the side of them and very thin oxide film existed on the top of them. The oxide film on TMS75 nickel-based alloy surface was smooth and compact, and the oxide film with the thickness of 180 μm and 120 μm existed both on the side and top of it, respectively. All the oxide films on the samples included acicular NaCl which interspersed in the oxide films, and thus made P92 heat resistant steel, 304 and 316L stainless steels become loose and easy to fall away from the metal substrates. However, the acicular NaCl had little influence on the oxide film on TMS75 nickel-based alloy surface.