Abstract: A pipeline stray current model was established, and the relationship between stray current and the distance between metro and substation, soil resistivity, metro traction voltage and the distance between rail and buried pipeline, as well as its interference law to pipeline with damaged anticorrosive layer was studied. The results show that the interference of the stray current on the pipeline decreases with the decrease of the distance between the metro and the substation and the traction voltage of the metro, also decreases with the increase of the soil resistivity and the distance between the rail and the buried pipeline. The stray current of buried pipelines increases as the damaged area of the pipeline coating increases, and the damaged pitting corrosion near the substation is more serious. The coating damage pipe-to-soil potential distribution can intuitively determine the location of damaged point. It provides a new positioning analysis method of pipeline anticorrosive coating damage point, and theoretical support and guidance for stray current on steel gas pipeline of potential high risk areas of judgment and as well as theoretical basis for the location selection for new pipelines.