Realize the situation about CO2 emission in Europe and China. Find out which reasons caused the CO2 emission will be changed. We did the data collection: CO2 emissions from China and EU. Energy consumption (include the total, electricity and transportation) and energy structure. Increased CO2 emission caused by Global warming. The CO2 emission increased with fossil-fuel use increased. China almost used of fossil energy, in 2004, domestic use for coal achieve to 67.7% of the total energy consumption. In 2010, the coal supply account for 48% of the world; the coal supply in 2000 to 2009 increased 85.5%. The CO2 emissions in 2009 is 6803.92 mil-tones, increased 13.32% than 2008, No. 1 of world. EU energy structure is keep changed, the rate of utilization for traditional fossil-fuel was gradually reduced. In 2010, the EU coal supply 8% of the world, 2000-2009 presents negative growth (3.8%). The CO2 emissions in 2009 were 4310.3 mil-tones, more than 2008 years to reduce 6.9%. CO2 emission based on energy consumption; Energy consumption is supply a variety of services to people. We must consider with population. China’s CO2/per capita less than average level in world, and lower than most EU countries.   China and EU are planning for future energy structure (reduce the use of fossil-fuel and increase renewable energy construction), that means up to energy saving and emission reduction purpose. The emission reduction of focus is to change the energy structure, reduce fossil-fuel use. China predicting the coal utilization rate under 60% of the total energy consumption. Thus, by 2020, forecast reducing 40-45% CO2 emission based on 1995. EU energy structure better than china, while they planning energy saving reach 20% at 2020, and improve the renewable energy use. By 2020, EU-27 forecast reducing 20% CO2 emission based on 1990 CO2 emission.