Based on the analysis of the key influencing factors of H2S corrosion resistant steel plate ( wass fraction/% ：0.16C

0.32Si

1.25Mn

0.018Al

0.0007S

0.007P) in failure process

the mechanism of H

2

S corrosion failure and the method of improving the corrosion resistance of H

2

S are illustrated by comparing the influence of inclusion and banded structure on H

2

S corrosion performance. The results show that MnS inclusion and continuous banded structure are the key factors that lead to the corrosion cracking of H

2

S

and the HIC corrosion performance can be obviously improved as the banded structure is changed by continuous-intermittent twice 880 ℃ as 60 min normalized treatment and the Length crack sensitivity is 0.