Abstract: FLACS software was used to establish a threedimensional physical model of an oilhydrogen refueling station.The leakage accidents of highpressure hydrogen storage cylinder and filler were simulated, and the effects of roof shape, wind speed and direction on hydrogen leakage accident were analyzed. Research shows that when the filler leaks, the common oil station roof will cause a large amount of hydrogen accumulation, and the inclined roof can significantly reduce the amount of combustible hydrogen cloud. The roof should be renovated in the process of reconstruction of the oil- hydrogen refueling station. With the increase of wind speed, the gas cloud area formed after the leakage of highpressure hydrogen storage cylinder increases gradually in the horizontal direction, but decreases gradually in the vertical direction. Gas clouds tend to gather on the ground, and the risk of ignition increases.Wind can disperse and dilute the leaked hydrogen, but when the hydrogen enters the high blockage barrier area under unfavorable wind direction, the amount of combustible gas cloud increases. It is necessary to consider the local dominant wind speed and wind direction to make a reasonable layout of oil-hydrogen sta⁃ tion.

Key words: oil- hydrogen station, high pressure hydrogen, leakage and dispersion, numerical simulation, fire risk