Abstract: Interface corrosion characteristics of V-5Cr-5Ti alloy in chloride solution were studied by electrochemical impedance spectroscopy (EIS), optical microscope, scanning electron microscope (SEM) and X-ray energy dispersive spectroscope (EDS), and compared with that of V. The results indicate that in 50 μg/g Cl^- potassium chloride solution, EIS of V and V-5Cr-5Ti alloy has same capacitance arc characteristic, their interface corrosion physical structure model can be represent as equivalent circuit as R₁(Q₁(R₂(Q₂R₃))). Charge transfer resistance of corrosion electrode process of V is much higher than that of V-5Cr-5Ti alloy. Interface corrosion characteristic of V is homogeneous, but V-5Cr-5Ti alloy is localized. Corrosion resistant performance of V is better than that of V-5Cr-5Ti alloy.