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Nanjing Ganghua Gas Company discovered that there are strong interference stray currents on the high-pressure pipeline of natural gas in the Maqun area, which greatly exceeds the industry standard “Technical Standard for DC Discharge Protection of Buried Steel Pipeline SY/T0017-2006”. It is proposed that when the mean value of the forward displacement of the ground potential at any point of the pipeline is greater than 100mV, drainage protection or other protective measures must be taken. Combined with the shortcomings of conventional technology stray current protection, a new monitoring and protection method is proposed. The scheme designed in this study adopts the method of stray current compensation to avoid the clutter of the stray current to the natural gas high-pressure pipeline. By designing a monitoring and protection system, the system is added with the same magnitude and opposite direction of the subway power supply. The compensation current, which in turn reduces or cancels the stray current generated in a particular interval. The test results show that the method designed in this paper greatly reduces the stray current, which meets the relevant standards of gas pipelines, and greatly improves the safety of rail transit.