This article reviews the research progress of hydrogen production technology

analyzes the background of hydrogen energy development

sorts out and interprets China's current policies related to hydrogen energy

and investigates several typical hydrogen production projects in China. The application status and key technology principles of hydrogen production are sorted out and compared

including the principles of hydrogen production from coal

hydrogen production from alcohols

and hydrogen production from water electrolysis

electrolytic cell structure

and mathematical models. Moreover

the significance of the conversion from "gray hydrogen" to "green hydrogen" is analyzed

which provides reference for the development of key technology of "green hydrogen" production.