Abstract: Corrosion behaviors of 304 L stainless steel in different pH value potassium permanganate solution were investigated using the gravimetric analysis method,scanning electron microscope（SEM）,potentiodynamic polarization.Most of the corrosion products are on the surface of 304 L stainless steel exposed in acid potassium permanganate（NP,pH=1.8）.A minimum of corrosion products are on the surface of 304 L stainless steel exposed in potassium permanganate（HP,pH=6.5）.Corrosion products on the surface of 304 L stainless steel exposed in alkalinity potassium permanganate（AP,pH=12.5） are in middle.All specimens through reduction cleaning process of nitric acid and ascorbic acid show metallic luster.And there is no obviously effect on micromorphology of 304 L stainless steel exposed in NP,HP and AP solution.The corrosion density ic of 304 L stainless steel in HP solution is less than that in NP and AP solution.The results have showed that the corrosion ability of NP and AP solution for 304 L stainless steel is more vigorous than that of HP solution in the chemical decontamination process.