Abstract: Based on the corrosion issue of sealing surface material for RPV in some nuclear projects,the corrosion properties of sealing surface material for RPV under abnormal working conditions were investigated.The corrosion behavior of 308L stainless steel were studied by using autoclave in different contents of Cl-solutions,and these samples were observed and analyzed by means of the metalloscope and Scanning electron microscope（SEM）.Results show that no pitting,crevice and stress corrosion occurred,when the content of Cl-was lower than 1 mg/L at the temperatures of 270℃ and the pressure of 5.5 MPa.However,with the increase of the content of Cl-,the susceptibility to pitting,crevice and stress corrosion of 308L was enhanced remarkably.