The alloy with high conductivity, thermal conductance and strength can be used as the interconnect to reduce the temperature of solid oxide fuel cell (SOFC). The chromium-containing ferritic stainless steels are selected as the leading candidate alloys in the application and study of interconnects for intermediate and low temperature SOFC due to thermal coefficient of expansion matching with the component material of SOFC, easy processing, low cost, etc.. However, issues caused from both interface resistance change induced from surface high-temperature oxidation, and the Cr volatilization and deposition to the cathode, have become the major reasons to influence the long-term stability of SOFC. Therefore, effective surface treatment must be carried out. Based on the degradation mechanism induced from alloy interconnect of SOFC stack, the work illustrates several methods to reduce or prevent cathode Cr poisoning and summarizes that it is necessary to prepare a protective coating on the surface of interconnect alloy. In combination with the previous study by the authors about the Mn0.9Y0.1Co2O4 (MYC) protective coating of nanostructure on alloy interconnect prepared by the spinel powders reduction technique, the domestic and overseas development of coating materials and fabrication methods for SOFC alloy interconnect are elaborately reviewed. For comparison of the advantages and disadvantages of all kinds of coating materials and coating preparation methods, the perovskite structure and spinel structure materials are highlighted due to high electrical conductivity and practical application ability. Finally, the outlook of alloy interconnect coating is outlined.