Combustion accelerant is a kind of highly flammable, volatile, and easily polluted substance, which is difficulty to extract and identify in the fire scenes. In order to solve the issue of identifying the accelerant, a liquid combustion atmosphere simulation system was developed in the Lab to simulate the fire environment involving ethanol accelerant. Herein, the oxidation behavior of 304 stainless steel was studied via the Lab simulation system in the combustion atmosphere of air-ethanol at 600-800 ^oC in terms of the corrosion kinetics, the composition and morphylogy of corrosion products, and the steel microstructure variations. The resuts show that the oxidation behavior of 304 stainless steel in the ethanol combustion atmosphere differ significantly from that in air, making it impossible to form a continuous protective oxide scale on its surface and thus catastrophic oxidation occurs. The surface oxide scale is composed of island-like oxide clusters of Fe₂O₃ and Fe₃O₄. Furthermore, oxidizing atmosphere induced by ethanol flux combustion along with turbulence will accelerate the chromium consumption from the steel, as well as enhanced the separation of oxide scale. Besides the oxidation rate also increases with the increasing test temperature. It follows that the above findings may be helpful to identify if there existed or not accelerant components in the fire scenes.