It is important for the outside anti-corrosion systemto protectthe high pressure buried steel pipeline from the corrosion. Thedetectiontechnique of the anti-corrosion provides the reliable guaranteefor the usage, evaluation and restoration of the anti-corrosion system. The article elaboratesthe PCM technique about the anti-corrosion coating and the CIPS technique about the cathode protection system. Together with the actual project, the articleintroducesthe application of the twodetectiontechnique in the project.%高压天然气钢质埋地管道外防腐系统对管道的腐蚀保护起着至关重要的作用。防腐检测技术对管道外防腐系统的使用、评价和修复提供了可靠保证。文章阐述了外防腐层的PCM法检测技术和阴极保护系统的CIPS法检测技术。结合工程实例，介绍了两种检测技术在实际工程中的应用。
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