采用四通道快速数据采集存储器和计算机数据处理技术,对紧靠上海地铁一号线沪闵路段的埋地输油管道受杂散电流干扰的情况进行了现场检测.测试结果充分说明干扰来源于地铁列车的运行,其特点是双向动态干扰,没有固定的阴极区和阳极区.从实际条件出发,利用原来保护该输油管道所埋设的镁阳极作接地床,采用极性接地排流方式来抑制杂散电流干扰,各处的排流效果介于60%～100%. Using four-channel fast data acquisition memory and computer data processing technology, on-site detection of the inland oil pipeline close to the Humin section of Shanghai Metro Line by the stray current interference.The test results fully demonstrated that the interference from the subway train , Which is characterized by two-way dynamic disturbance without fixed cathode area and anode area.According to the actual conditions, the magnesium anode buried in the oil pipeline is used as the ground bed, and the polar ground drain method is adopted to suppress the stray current Current interference, drainage effect across the range of 60% to 100%.