Abstract: The elemental sulfur deposition often occurs in the exploitation of high sour gas field. The presence of elemental sulfur has been long known to corrode carbon steel extremely and may block the gathering lines. It will influence the normal production of gas fields. This paper introduces the source and damage of elemental sulfur (S) in sour gas field. Based on this information the corrosion evaluation method is stated in detail, while the application range of each corrosion evaluation method and their characteristics are analyzed, as well as the mechanism of elemental sulfur corrosion. In the end, the detailed understandings and suggestions according to the current situation in China are proposed.