In this paper, the synthetic effect of Cr, Mo and Y on corrosion resistance was explored, and the Y~(Cr/Mo) value was employed to evaluate the corrosion resistance. The composition of amorphous alloy was designed by mixing the Fe_(41)Co_7Cr_(15)Mo_(14)C_(15)B_6Y_2(BMG1) with good glass forming ability(GFA) and Fe_(50)Cr_(22)B_(23)Ni_(5.4) with a high corrosion resistance at 9:1 ratio. At the same time, the contents of Y, Mo and Cr were fine-tuned. The electrochemical tests demonstrated that the passivation current density decreased with the increase of the Y~(Cr/Mo) value. The passivation current density of Fe-based amorphous alloy was reduced by about half an order of magnitude. The fitting result showed that the logarithm of passivation current density(I) and the Y~(Cr/Mo) value(X) were logarithmic relationship, and the fitting equation was I=–5.649+4.904×10~(15)e~(–17.52x). The X-ray photoelectron spectroscopy(XPS) results showed that the Y~(Cr/Mo) value played a key role in stability of passive films. When the Y~(Cr/Mo) value was low, the Cr~(6+) ion, Mo~(6+) ion were enriched in the initial stage of passivation process, then leading to the increase passivation current density. However, when the Y~(Cr/Mo) value was high, the low-valence Fe~(2+), Cr~(3+), and Mo~(4+) ion were enriched more easily, which result in small passivation current densities and more stable passive films. In this paper, the synthetic effect of Cr, Mo and Y on corrosion resistance was explored, and the Y ~ (Cr / Mo) value was employed to evaluate the corrosion resistance. The composition of amorphous alloy was designed by mixing the Fe_ (41 ) Co_7Cr_ (15) Mo_ (14) C_ (15) B_6Y_2 (BMG1) with good glass forming ability (GFA) and Fe_ (50) Cr_ (22) B_ (23) Ni_ (5.4) 1 ratio. At the same time, the contents of Y, Mo and Cr were fine-tuned. The electrochemical tests demonstrated that the passivation current density decreased with the increase of the Y ~ (Cr / Mo) value. Fe-based amorphous alloy was reduced by about half an order of magnitude. The fitting result showed that the logarithm of passivation current density (I) and the Y ~ (Cr / Mo) value (X) were logarithmic relationship, and the fitting equation was I = -5.649 + 4.904 × 10 ~ (15) e ~ (-17.52x). The X-ray photoelectron spectroscopy (XPS) results showed that Y ~ (Cr / Mo) value played a key role in st When the Y ~ (Cr / Mo) value was low, the Cr ~ (6 +) ion, Mo ~ (6 +) ion were enriched in the initial stage of passivation process, then leading to the increase passivation Current density. However, when the Y ~ (Cr / Mo) value was high, the low-valence Fe ~ (2+), Cr ~ (3+), and Mo ~ (4+) ion were enriched more easily, which result in small passivation current densities and more stable passive films.