The corrosion of carbon steel in concentrated LiNO3 solution at high temperature was investigated by a weight loss method. Results showed that increasing temperature and pH would increase the corrosion rate, and increasing concentration and adding Li2CrO4 would reduce the corrosion rate. The corrosion in LiNO3 solution was general corrosion and the corrosion products were composed of Fe3O4 and Fe2O3. A compact passive layer comprising of Cr2O3, Fe3O4 and Fe2O3 was observed with adding Li2CrO4, and it could effectively depress the corrosion. The carbon steel corrosion in LiNO3 solution was much smaller than that in LiBr solution