对套管处管道腐蚀产生的严重危害和数值模拟技术在阴极保护上的应用做了总结和论述，并且利用COMSOL Multiphysic仿真模拟软件，联合使用有限元法和边界元法，分别研究了套管存在、套管两端是否密封、套管与管道涂层质量、电解质电导率、套管内是否有牺牲阳极以及套管内管道涂层出现缺陷点等情况对管道电位分布的影响规律，揭示套管屏蔽导致的管道腐蚀机理，为管道腐蚀防护的设计和安全管理提供了理论参考。

The serious damage caused by pipeline corrosion of casing and the application of numerical simulation technology to cathodic protection are summarized and discussed. COMSOL Multiphysic simulation software was used in combimation with finite element method and boundary element method to study the law of the effect of some factors, on the pipeline potential distribution of casing. The factors included whether both ends of the casing were sealed, coating quality on the surface of pipeline or casing, electrolyte conductivity in the annular space, whether sacrificial anode existed inside casing and whethed holidays appeared in the coating on the pipeline inside casing, The study was aiming at revealing the corrosion mechanism resuting from the casing shield and providing theoretical reference for design and safety management of the pipeline corrosion protection.