海底管道是海上油气集输的主要载体，由于管材一般为碳钢，容易遭受内腐蚀，并造成管线泄漏等失效事件。为降低管道运行风险，减小腐蚀危害，从全生命周期完整性管理的角度分析了海底油气管道内腐蚀发生的原因及机理，提出了基于完整性管理下的设计选材、制管、施工、运营维护等各阶段的腐蚀防护措施。

Submarine pipelines are the main carrier of offshore oil and gas gathering and transferring. And they are generally carbon steel, which are susceptible to internal corrosion and cause pipeline leakage failure. In order to reduce the risk of pipeline corrosion damage, from the view of integrity in whole life cycle management, this paper analyzes the causes and mechanism of internal corrosion for submarine pipelines of oil and gas, and puts forward the protective measures in each stage of design material selection, pipe making, construction, operation and maintenance.