The　corrosion　behavior　of　X80　pipeline　steel　in　3.5　wt.%　NaCl　solution　and　simulated　Dagang　soil　solution　under　different　alternating　current　(AC)　electrical　densities　was　studied　using　the　weight　loss　method,　and　was　tested　and　analyzed　using　the　electrochemical　test　technique　and　surface　analysis　technique,　such　as　open　circuit　potential　(OCP),　polarization　curve　and　scanning　electron　microscopy　(SEM).　The　results　showed　that　the　corrosion　potential　of　X80　pipeline　steel　was　negative　under　the　coupling　of　AC　and　stress.　With　the　increase　of　AC　stray　current　density,　the　negative　shifted　rate　of　corrosion　potential　increased,　which　indicated　that　the　electrochemical　corrosion　behavior　of　X80　pipeline　steel　aggravated　due　to　the　coupling　of　AC　stray　and　stress.　In　addition,　the　coupling　of　AC　stray　current　and　stress　affected　the　corrosion　process　of　X80　pipeline　steel,　which　did　not　show　any　tendency　of　passivation　in　the　experimental.　Under　the　action　of　the　alternating　stray　current,　the　reduction　reaction　of　H-2　and　O-2　occurred　in　X80　pipeline　steel　in　the　solutions　of　3.5%　NaCl　and　Dagang　soil.　When　the　applied　stress　was　kept　constant,　the　corrosion　morphology　of　X80　pipeline　steel　samples　underwent　uniform　corrosion　under　low　AC　stray　current　density　(0　-　100　A/m(2)),　whereas　the　corrosion　morphology　of　X80　pipeline　steel　samples　showed　that　the　pitting　corrosion　occurred　under　the　action　of　high　AC　stray　current　density　(100　-　300　A/m(2)).