The work aims to investigate and verify the permeability of hydrogen gas through ethylene-tetrafluoroethylene copolymer (ETFE) films in the temperature range of 0 to 50 ℃. Firstly, the characteristic variable - the permeation factor fp, which characterized the gas permeation rate of ETFE films, was derived based on the molecular diffusion theory. Secondly, the permeation factor of ETFE films to hydrogen gas of different concentrations at different temperatures was rapidly determined by the thermal conductivity method. Thirdly, the results were analyzed by combining the reaction activation energy theory with the experimental data of the permeation factor, and the conclusion was drawn by comparing the actual measured permeation factor fp with the theoretical calculated permeation factor Fp at the same temperature. Finally, the correctness of the results was verified by experiments. The relationship between the temperature te and the hydrogen permeation factor fp was as follows:at different hydrogen concentrations, the reciprocal of the absolute temperature and the natural logarithm of fp were linearly related. At the same temperature, the actual fp was close to the theoretical Fp. In the temperature range of 0 to 50 ℃, the effect of temperature on the hydrogen permeability of ETFE films conforms to the Arrhenius equation. This study provides certain reference value for the application of ETFE films in the field of gas permeability and protection.