Abstract: In this paper, the corrosion of oil associated gas at Palouch FPF station in the South Sudan was analyzed to provide the theoretical basis for gas material selection and corrosion prevention design of its expansion project. The effects of system pressure, water-phase pH value, temperature and wall shear stress on the corrosion of oil associated gas at Palouch FPF station were studied by using the CO₂ corrosion calculation method described in "Calculation Model of CO₂ Corrosion Rate"(NORSOK M-506, 2005). It is indicated that in the change interval of associated gas parameters of this project, associated gas corrosion is significantly affected by pressure and water-phase pH value, and it increases sharply with the increase of pressure and the decrease of water-phase pH value. As the temperature rises, associated gas corrosion increases gradually and then decreases gradually after it reaches the peak value in the range of 40-80 ℃. Associated gas corrosion is also increased with the increase of wall shear stress, but compared with other factors, wall shear stress has less effect on the change of associated gas corrosion. And accordingly the countermeasures to prevent CO₂ corrosion were recommended.