In present manuscript, A entire literatures review of thermal barrier coating applications in diesel engines is performed to select suifigtype & to locate coating effects. The coating system has special effects on the fuel consumption, the power and the combustion efficiency, pollution contents. Usually there are several beneficial influences by applying ceramic layers on the combustion chamber as well as the piston, the cylinder head, the cylinder block, and intake and exhaust valves by using a plasma spray method. Also several disadvantages such as producing nitrogen oxides also exist when a coating system is used. In this editorial, all effects, advantages and disadvantages of thermal barrier coatings are investigated based on existing articles.