利用ANSYS有限元分析软件，建立了土壤、空气、带防腐蚀涂层钢质管道的模拟模型，研究了土壤介质、管道埋深、邻近交叉载流管线、杂散电流等因素对埋地管道防腐蚀层检测中地表电位的影响。结果表明：不同土壤介质交界处和不同土壤埋深处，地表电位出现畸变，邻近载流管线和杂散电流的存在使地表电位信号出现类似漏点电位信号分布的趋势；杂散电流源距管道越近，对地表电位影响越大，反之越小；载流管线与检测管道交叉角度越小，对地表电位的影响越小。

Finite element analysis software ANSYS was used to build models of soil, air, pipeline with anticorrosive coating. The effects of soil medium, buried depth of pipeline in soil, adjacent carrying-current pipeline, stray current and other factors on the surface potential in detection of anticorrosive coating of buried pipeline were studied. The results show that the surface potential changed abnormally in the junction of different soil media or in the place where buried depth changed. Surface potentials showed a distribution trend similar to that of leak potential signals when carrying-current pipeline and stray current existed nearby. The nearer the stray current source was, the greater the influence on surface potential was. On the contrary, the influence was smaller. The smaller the angle of carrying-current pipeline crossing with test pipeline was, the smaller the influence on surface potential was.