Thes study measured and compared the electrochemical properties of the CrxFeCoNi alloys, including the FeCoNi, Cr0.5FeCoNi, and CrFeCoNi alloys under as-cast and as-annealed states. The polarization curves of those CrxFeCoNi alloys were tested in the solution of 1 M H2SO4 solution, and the testing temperatures were 30˚C, 40 ˚C, 50˚C, and 60˚C. Results indicated that the alloys containing Cr would be easily corroded under as-annealed state; and as-annealed FeCoNi alloy had better corrosion resistance. Furthermore, the currents of passive regions would gradually increase when the testing temperatures increased. Increasing the testing temperature would result in decreasing the passive regions.