Abstract: To enable the pipeline stray current corrosion protection to be more pertinent and effective, the dynamic stray current distribution of gas pipeline under the interference of rail transit traction current is simulated with Dymola. Taking the soil potential gradient as a judgment index, under the condition of some even damage existing in rail insulation resistance, dynamic stray current distribution of gas pipeline in a locomotive driving cycle is analyzed. Also, the stray current interference that pipeline received is discussed with different insulation joint locations and resistance and different sacrificial anode locations and group numbers. Finally, the best way to install insulation joint and sacrificial anode for stray current protection is given in this paper.