The publishing of 2019 Refinement to the 2006 Guidelines for National Greenhouse Gas Inventories shows the progress on exiting guidance since 2006 in general guidance and reporting，energy，IPPU，AFOLU and waste，by updating of existing methods and default emission factors，providing new methods and factors for new categories. By this regard，the completeness and accuracy of the national inventory would be significantly improved. Meanwhile，the new product could help the uniformity of the transparency rules under Paris Agreement and its implementation framework. China will have to shift to the new methodology，which may challenge the existing system. At the same time，the improvement on completeness will have noticeable impact on the volume of the total GHG emissions from China. Energy would be sector that witness the big change in emission number. Simultaneously，the improved guidance is helpful to push the coordination between climate change process and other works.