Most　of　the　buried　gas　pipe-line　corrosion　is　induced　by　the　dynamic　stray　current　leaking　from　the　rail　traffic.　Due　to　the　complexity　and　variability　of　the　field　environments,　in-depth　study　on　dynamic　stray　current　disturbance　and　corrosion　is　scare,　the　hazard　judgment　of　dynamic　stray　current　is　mainly　set　up　on　the　basis　of　working　experience.　A　stray-current　accelerated　corrosion　test　platform　was　set　up　to　investigate　the　time-varying　patterns　of　stray　current　and　the　changing　characters　of　pipe-to-soil　potential.　The　effects　of　soil　pH,　soil　conductivity,　stray　current　frequency　and　density　on　corrosion　rate　were　also　investigated.　A　math　model　was　built　to　establish　the　factors＇　contribution　rate　to　pipeline　corrosion　and　the　reliability　of　the　model　was　verified,　which　provides　theoretical　evidence　for　the　judgment　of　buried　gas　pipelines＇　corrosion　hazard.