Chinas carbon emission reduction is an essential issue for the Chinese government and also of international concern.Since China has become the largest carbon emitter,analyzing the evolution of economic development and carbon emissions of developed countries as well as carrying out detailed analyses on Chinas carbon emission and carbon intensity changes will be an essential reference for China's carbon reduction process.Through detailed analysis of trends in carbon emissions and carbon intensities in different countries,we applied the variable coefficient panel model to assess key factors including the industrial structure,energy structure,urbanization rate and economic development.Based on the above-mentioned results,we compared differences in carbon emissions and carbon intensities between China and major countries in the world with different influence of basic impact factors taken into consideration.Overall,the United States,Japan,United Kingdom,France,Italy and Canada have reached a carbon emission peak to varying degrees.In contrast to carbon intensities in different countries,Chinas intensity is quantified as 1.24kg/USD,which is still much higher than the global average.Overall,different factors have different degrees of influence on countries,but the urbanization rate and renewable energy ratio contribute significantly to carbon emission reduction when compared with others.Comparing the economic growth,carbon emissions,industrial structure and energy structure of different countries will lay a solid foundation for China and provide an essential support for the Chinese government to deal with global climate change and achieve carbon emission reduction targets at a macro scale.