Abstract: Objective Hydrogen pipeline transportation is the most economical long-term, large-scale, and long-distance hydrogen transportation method now. Compared with long-tube trailer and liquid hydrogen tanker, hydrogen pipeline transportation displays lower transportation cost, can achieve long-term continuous and stable supply of hydrogen gas, and is suitable for end-user with large-scale hydrogen gas consumption. Hydrogen embrittlement is prone to occur in pipeline steel, and replacing pipeline steel with non-metallic polymers can avoid the appearance of hydrogen embrittlement. However, few researches on hydrogen permeation behavior in polymers have been performed currently, and the further research for the hydrogen permeation behavior in polymers is necessary. Methods Six typical polymers used to be pipeline transportation materials have been selected and the micromorphology, chemical composition, crystal structure and hydrogen permeability coefficient of six polymers under hydrogen permeation at different temperature and low-pressure (0.5MPa) are characterized to analyze the hydrogen permeation behavior. Results For PE, PA, and PP, which may be used as hydrogen pipeline material, there are no large pores and cracks in their cross-sections at room temperature. At a higher temperature (~50 ℃), the pores and cracks in the PE cross-section are more than those in PA and PP. The chemical composition and crystal structure of the three non-metallic pipeline materials do not change significantly, with only a slight decrease in crystallinity. For PEEK, PVDF, and NBR, which may be used as sealing material for hydrogen pipeline, there was no obvious delamination or damage in their cross-sections at room temperature. At a higher temperature (~50 ℃), the cross-section of PEEK shows slightly rough, while PVDF and NBR have dense pores, with the risk of forming through-cracks. The chemical composition and crystal structure of the three sealing materials do not change significantly, and their crystallinity do not decrease either. Based on the above test results, the hydrogen permeation has less effect on the micromorphology, the chemical composition and the crystal structure of PE and PEEK than others, consistent with the results of hydrogen permeation coefficients. Conclusion The research results can be used to guide the selection of non-metallic pipe material and sealing material in the design of urban pure hydrogen pipeline networks. PE and PEEK are recommended to be used the non-metallic pipeline material and the sealing material in urban low-pressure pure hydrogen/hydrogen blending pipelines in future.