Abstract: The electrochemical methods were used to study the corrosion behavior of SuperCr13 in two kinds of simulated formation water environments. And the traditional 2Cr13 martensitic stainless steel was used as contrast material. The results show that the higher the content of HCO3- in the simulated formation water, the lower the Ecorr and the higer the corrosion current density. Meanwhile, the transfer resistance and passivation membrane resistance reduced, the module value of Warburg impedance decreased. Cycle polarization curves show that SuperCr13 and 2Cr13 have good passivation performance in the simulated formation water. The higher the protection potential, the better the passivation performance.