The corrosion of stainless steel piping for a precommissioning offshore platform in the South China Sea is sampled and analyzed. The conclusion obtained from the test is that the chloride ion content exceeds the standard leading to serious corrosion of stainless steel pipelines. This paper explores the basic principles of damage caused by chloride ions to 316L stainless steel pipeline. From the perspective of offshore platform pipeline construction， for how to effectively prevent corrosion of stainless steel pipelines， we put forward relevant recommendations， and provide reference for subsequent offshore platform construction projects.