This paper sorts out the existing ISO and national standards of the LCA carbon footprint assessment system and practice,then separates and identifies the units and scope of core elements among different standards,and puts the national standards in one framework of comparative analysis.The result shows that although there are some differences among each standards,internationalization and general adaptability have become the consensus of the future development of the assessment system.Finally,this paper points out that China’s LCA carbon footprint assessment standard system should not only be line with international standards but also take into account local characteristics,and try to enhance the standards of application breadth.