在阴极保护中测试管地电位,是判断地下钢质管道(以下简称管道)是否受到保护的重要方法。它快速易行,杂电区各种保护措施都要根据它来做出准确调整。本文推导了正常区、杂电区(或送电保护区)地下管道的管地电位测试公式,提出了提高测试管地电位精度的途径和测试最大杂电电位的方法以及通过测试管地电位来定性地鉴别管道防腐层老化损坏的情况,论述了提高防腐仪保护电位精度的两大要素。 Testing the potential of the pipe in cathodic protection is an important way to judge whether the underground steel pipe (hereinafter referred to as pipe) is protected. It is fast and easy, and all kinds of protection measures in the hybrid area should be accurately adjusted according to it. In this paper, the test formulas for the tube ground potential of underground pipelines in normal area and hybrid area (or power transmission protection area) are deduced. The ways of improving the ground potential accuracy of test pipelines and the method of testing the maximum potential of potential are put forward. Qualitatively identify the deterioration of pipeline anti-corrosion layer, discusses the two factors to improve anti-corrosion protection device potential accuracy.