Zircalloy coating is an important technical approach in the research of accident tolerant fuel(ATF).Research progress of accident tolerant coatings on zircalloy cladding outside surface after Fukushima accident is reviewed in this paper,with focuses on the key problems of coatings-coating material,fabrication process and characterizations. The coating materials which have been successfully applied to various zircalloys in nuclear power plants are introduced firstly,including metal coating,ceramic coating,alloy coating and multi-layer composite coating.Secondly,the fabrication processes of acci...