Abstract: The high pressure hydrogen storage bottle is often accompanied by the rise of temperature in the process of fast charging, and the standard requires that the maximum temperature rise is less than 85 °C. The excessive local temperature rise will reduce the material performance of the hydrogen storage bottle, and the bottle body will be subjected to greater mechanical thermal stress; if the hydrogen bottle is in a high temperature and high pressure environment for a long time, it may cause the bottle body to crack, expand, until it bursts and fails. In this paper, the hydrogen storage cylinders for heavy trucks are designed as double-port and single-port hydrogenation; then, the maximum temperature rise and the uniformity of temperature field after fast charging are studied through the numerical simulation so as to evaluate the advantages and disadvantages of the two hydrogenation methods. It is found that the temperature field in the double-mouth hydrogenation bottle is uniformly distributed, and the maximum temperature is 332.2 K; while the temperature field of the single port shows a cascade distribution, the bottom temperature of the hydrogen cylinder is high, and the maximum temperature is 426.6 K. It can be seen that the design of the double-port hydrogen storage bottle can reduce the temperature rise of fast charging, and the thermal stress of the hydrogen cylinder is uniform, which is safer to use.