It is promising for metal especially ferritic stainless steel (FSS) to be used as interconnector when the solid oxide fuel cell (SOFC) is operated at temperature lower than 800°C.However, there are many challenges for FSS such as anti-oxidant, poisoning to cathode and high area specific resistance (ASR) when using as SOFC interconnector.The effect of Cr content (12-30 mass%) in Fe-Cr alloys on thermal expansion coefficient (TEC), oxidation resistance, microstructure of oxidation scale and ASR was investigated by thermo-gravimetry, scanning electron microscopy, energy dispersive spec-troscopy and four-probe DC technique.The TEC of Fe-Cr alloys is (11-13)×10-6 K-1, which ex-cellently matches with other SOFC components.Alloys have excellent oxidation resistance when Cr content exceeds 22 mass% because of the formation of chromium on the surface of alloy.The oxida-tion rate constants kd and ks decrease rapidly with increasing the Cr content and then increase slowly when the Cr content is higher than 22 mass%.The kinetic results indicate that Cr evaporation must be considered at high temperature for Fe-Cr alloys.After the alloys were oxidized in air at 800°C for 500 h, log(ASR/T) (T is the absolute temperature) presents linear relationship with 1/T and the conduct activation energy is 0.6-0.8 eV (Cr16-30).Optimal Cr content is 22-26 mass% consider-ing the oxidation resistance and ASR.