Abstract:FeAl/Al2O3 composite coating is the most promising candidate for the tritium permeation barrier (TPB) of structural materials in the tritium breading blanket and auxiliary tritium handling system in fusion reactors. The preparation process of the FeAl/Al2O3 coating generally involves two steps of aluminization and oxidation. Interdiffusion occurs between Al atoms and Fe atoms on the base surface to form (Fe,Al) solid solution or Fe-Al intermetallic transition layer in the aluminization step. In the oxidation step, the aluminide layer surface is selectively oxidized to form Al2O3 film. FeAl/Al2O3 coating can be prepared by the technique of physical vapor deposition (PVD), chemical vapor deposition (CVD), hot-dipping aluminization (HDA), packing cementation (PC), plasma sputtering (PS) and electro-chemical deposition (ECD) et al. Relatively speaking, CVD, HDA and PC technique are promising in coating preparation, and have potentials to be selected as the candidate engineering preparation technique of FeAl/Al2O3 composite TPB coating in fusion reactors. Meanwhile, ECD technique is rather appealing for the preparation of FeAl/Al2O3 TPB coating because of its easy process controlling, stable coat performance and availability of coating complex-shaped structure.