Abstract: An experimental was conducted to study the effect of high temperature and salt on anti-corrosion property of stainless steel SUS321 and SUS309. The result showed that salt made the high temperature anti-corrosion property of SUS321 and SUS309 largely fall down. As the result,the anti-corrosion temperature of SUS321 and SUS309 dropped from 830 ℃ and 880 ℃ down to lower than 750 ℃.