Abstract: Objective To evaluate the corrosion resistance of two kinds of Ni-Cr alloy and Neotitan Ni-Cr-Ti alloy. Methods Electrochemical methods were used to measure the self-corrosion current density（Icorr ） , polarization resistance（Rp） and self -corrosion potential（Ecorr ） of three alloys. And the polarization curves of the three alloys were recorded at the same time. Field scanning electron microscope（FSEM） was used to observe the corrosion in the surface of the three alloys. One-way ANOVA with SPSS 11.0 software package was used for statistical analysis. Results The Icorr of Bellabond Ni-Cr alloy was lower than that of Neotitan Ni -Cr-Ti alloy（P<0.05）and Yuehai Ni-Cr alloy（P>0.05）. The Icorr of Yuehai Ni-Cr alloy was lower than that of Neotitan Ni-Cr-Ti alloy
（P＞0.05）. The Rp of Bellabond Ni-Cr alloy was higher than that of Yuehai Ni-Cr alloy（P<0.05） and Neotitan Ni-Cr-Ti alloy（P<0.05）. The Rp of Yuehai Ni-Cr alloy was higher than that of Neotitan Ni-Cr-Ti alloy（P>0.05）. The Ecorr of Bellabond Ni-Cr alloy was lower than that of Yuehai Ni-Cr alloy（P>0.05） and Neotitan Ni-Cr-Ti alloy（P>0.05）. The Ecorr of Neotitan Ni-Cr-Ti alloy was higher than that of Yuehai Ni-Cr alloy（P>0.05）. FSEM showed that the corrosion in the surface of Bellabond Ni-Cr alloy was slighter than that of Yuehai Ni-Cr alloy
and Neotitan Ni-Cr-Ti alloy. Conclusion The corrosion resistance of Bellabond Ni-Cr alloy is better than that of Yuehai Ni-Cr and Neotitan Ni-Cr-Ti alloy. The corrosion resistance of Neotitan Ni-Cr-Ti alloy had no difference compared with that of Yuehai Ni-Cr alloy.