After years of development, the hydrogen energy industry chain has gradually improved. The upstream of hydrogen energy is the preparation of hydrogen, the main technical methods include thermochemical reforming of traditional energy, electrolyzed water, etc. The middle stream is the storage and transportation of hydrogen, the main technical methods include low temperature liquid, high pressure gaseous and solid material hydrogen storage. The downstream is the application of hydrogen, hydrogen applications can penetrate into all aspects of traditional energy sources, including transportation, industrial fuels, power generation, etc. the main technologies are direct combustion and fuel cell technology.