The corrosion behavior of Fe13Cr5Al4Mo alloy in 70 μL/L LiOH aqueous solution at 360 °C,18.6 MPa was studied using a static autoclave to assess its corrosion resistance. The microstructure of the oxide film on the Fe13Cr5Al4Mo alloy after corrosion was investigated by SEM, TEM and EDS. The results show that the Fe13Cr5Al4Mo alloy exhibits corrosion weight loss in lithiated water, which is related to the dissolution-redeposition process of Fe oxide affected by LiOH. The oxide film formed on the alloy during the long-term corrosion in lithiated water is mainly composed of Fe(Cr,Al)₂O₄, and a small amount of Fe₃O₄ present near the outer surface. The Fe(Cr,Al)₂O₄ layer can hinder the diffusion of metal ions and oxygen ions within the oxide film, which in turn retards further corrosion of the alloy.