Research conclusions: Now the problems caused by the pipeline crossing and paralleling with the metro track become more and more, so the pipeline operators should cooperate with the metro operator. (1) The metro designer and operator of the metro should control the total volume of the stray current，monitor the internal system and discharge the current to make the stray current in the certain range with on impact on the external system. (2) The pipeline operators should insulate and cathodically protect the pipeline. In the area where the pipeline crosses or parallels with the metro track, the monitoring spot should be added, the corrosion-proof coating should be thickened and the anodic discharge current should not be conducted.