Abstract: Against the backdrop of the accelerated global energy transition, hydrogen, as a clean and efficient energy carrier, has its large-scale storage and transportation emerging as a key bottleneck restricting industrial development. Converting existing natural gas pipelines for hydrogen transportation constitutes a crucial approach to reducing the construction costs of hydrogen energy infrastructure and shortening the construction cycle. Taking the “Flow – making hydrogen happen” natural gas pipeline conversion project for hydrogen transportation by Germany’s GASCADE as the research object, this paper systematically analyzes its project overview, key technological breakthroughs and standard application experience. By comparing the differences between China and Germany in terms of materials, equipment, welding, sealing and metering for X70 pipeline systems, the paper reveals the core distinctions between the two countries’ hydrogen pipeline standard systems. On this basis, combined with the current development status and national conditions of China’s hydrogen energy industry, targeted hydrogen energy development strategies are proposed, which provide a reference for the engineering practice of natural gas pipeline conversion for hydrogen transportation and the high-quality development of China’s hydrogen energy industry.