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To clarify the interference situation, interference law and corrosion law of different pressure level system of mega-city gas pipeline network under the influence of different railroad lines, 37 test piles of nearly 10 pipelines crossing or parallel with electrified railroad were selected for a 24-hour data monitoring and analysis, and the interference law and risk situation of Beijing area under dynamic AC stray currents were identified. Results showed that sub-high voltage and above gas pipeline networks were significantly more affected by the interference of electrified railroad than medium and low voltage pipeline network in Beijing area;the sacrificial anode cathodic protection system of city gas pipeline network had a certain degree of drainage mitigation and anti-interference function for stray current interference;the AC interference on pipelines parallel with electrified railroad was greater than that on crossing pipelines, and the peak was related to locomotive location. For the corrosion risk under dynamic AC interference, it was recommended to evaluate it by combining the proportion of AC current density range with outage potential.