Coke inhibition is one of the key issues for hydrocarbon fuel cracking. In the work reported in this paper, controllable cracking with greatly reduced coke deposits has been realized by the addition of a little ethanol over a bifunctional coating. The coating, consisting of perovskite and phosphotungstic acid, is prepared in a nickel-based super alloy tube reactor (diam. 3 mm X 0.5 mm X 1000 mm) by the wash-coating, method. Scanning electron microscopy (SEM), energy-dispersive Xray spectroscopy, and X-ray diffraction are utilized to characterize the morphology and phase composition of the coating and cokes. The results show that BaWO4, BaCeO3, SiO2, and H3PW12O40 coexist in the 4.2 mu m coating with a uniform distribution. The anti-coking tests were conducted during the supercritical thermal cracking of RP-3 Chinese jet fuel with a flow rate of 1 g/s for 30 min at 700 degrees C and 4 MPa. The results show that the efficiency of coke inhibition reaches up to 96%, and the stability (i.e., pressure drop of tube reactor and cooler) of the system has been effectively improved. The deposited cokes were characterized by temperature-programmed oxidation and SEM. The pyrolysis products, including gas and liquid, were also analyzed. The results indicate that the strategy based on ethanol and a bifunctional coating not only plays an important role in eliminating the coke deposits on the reactor tube walls but also reduces the amount of typical coke precursors related to the aromatic condensation cokes. A possible mechanism for the process has been proposed. In general, phosphotungstic acid in the coating is capable of catalyzing the dehydration of ethanol for the production of water. Meanwhile, the perovskite structures can remove coke deposits on the coating through carbon steam gasification reaction.