Abstract: The corrosion behavior of N80 steel under different environmental factors was explored. Polarization Curve, AC impedance spectroscopy test, SEM and other methods were used to study the effects of H⁺, S^2- and Cl^- ions on the corrosion behavior of N80 steel in saturated CO₂ simulated oilfield production fluid.The results show that the influence of the three aggressive ions on the corrosion behavior of N80 steel is H⁺, S^2-, Cl^-.The corrosion rate of N80 steel increases with the concentration of three kinds of aggressive ions. In the environment of low concentration of Cl^-, the corrosion morphology of N80 steel is mainly mesa corrosion and local corrosion, and in the environment of high concentration Cl^-, it is mainly pitting corrosion. H⁺ can cause serious local corrosion and uniform corrosion of N80 steel, and the corrosion failure of N80 steel caused by S^2-is mainly local corrosion.