This report provides an overview of the existing hydrogen production technologies and the full life cycle analysis （LCA） results of greenhouse gas emissions from fuel cell vehicles. The development status and trend of the related technical routes in the whole life cycle of hydrogen energy （hydrogen energy preparation，storage and transportation and fuel cell vehicle operation） are analyzed in detail. A representative route （natural gas reforming and hydrogen production-tube bundle car pipeline transportation-passenger car route） was selected to calculate the whole life cycle greenhouse gas emissions，and compare it with traditional vehicles and battery electric vehicles. It is found that the carbon footprint of fuel cell vehicles will be greatly affected by the progress of the three parameters：raw natural gas consumption，fuel natural gas consumption and process power consumption during the process of hydrogen production from natural gas.