Corrosion　behavior　of　X70　and　X80　steel　in　simulated　soil　solution　with　AC　interference　was　studied　by　applied　open　circuit　potential,　polarization　curve,　scanning　electron　microscope　and　gravimetry.　The　corrosion　potential　of　X70　and　X80　steel　shifted　negatively　with　increasing　AC　density.　Polarization　curves　were　all　in　active　dissolution　zone　without　passivation　area.　At　the　low　AC　density　(0-100　A/m(2)),　the　corrosion　rate　of　X70　steel　increased　rapidly　with　the　density　increase,　while　the　change　of　corrosion　rate　of　X70　steel　was　not　as　obvious　at　high　AC　density　(100-300　A/m(2)).　Under　the　AC　interference　with　density　of　0-300　A/m(2),　the　corrosion　rate　of　X80　steel　increased　steadily　with　the　increase　of　AC　density.　At　the　same　AC　density,　the　corrosion　rate　of　X70　steel　was　about　2　times　higher　than　that　of　X80　steel.　At　the　low　AC　density,　the　surface　morphology　of　the　corroded　X70　showed　uniform　corrosion:　the　sample　surface　was　relatively　smooth.　At　the　high　AC　density,　more　numerous　and　larger　corrosion　pits　were　observed.　When　AC　density　was　0-200　A/m(2),　the　corrosion　morphology　of　X80　steel　was　uniform　with　the　smooth　surface,　only　with　some　pitting　corrosion　at　300　A/m(2)　AC　density.　Thus,　corrosion　resistance　of　X80　steel　was　better　than　that　of　X70　steel　in　simulated　soil　solutions.