Abstract: Electrochemical testing, scanning electron microscope(SEM) observation, energy spectrum analysis were used to study the corrosion behavior of X100 pipeline steel after it was immersing in Korla soil simulated solution for 6,10,30,50 d. The results show that, with the increase of X100 pipeline steel being immersing in Korla soil simulated solution, corrosion rate first increased and then decreased, and the corrosion tendency gradually increased. The general corrosion was main after the steel was immersing for 10-30 days, and gradually transformed into mainly pitting after the steel was immersing for over 30 days. The corrosion products were mainly iron oxides and infinitesimal sulphides, and chloride ion in soil was the dominant factor causing pitting.