The UN's Intergovernmental Panel on Climate Change (IPCC) adopted four groups of representative concentration pathways (RCP) emission scenarios for the analysis on global greenhouse gas concentration and climate impact in the fifth assessment report. But the current research on the specific pathways of the emission pathways implementation is less. This paper distributes CO_2 emissions space of RCP scenarios description with the scheme of "contraction and convergence", reflecting development demands of developing countries, and analyses the emissions pathways and energy economy effect on all regions in the world using global multi-regional dynamic general equilibrium model. Research shows that, due to the different development stages and characteristics, the difference of the reduction cost is great within different countries. China's economic losses (between 3% and 12%) is obviously higher than the European Union or the United States, and the Chinese economic impact of implementing strict emissions before 2030 is more than after 2030. Thus, China need careful international emission reduction commitment and should also seek more international support and help. The establishment of the global carbon emissions cap-and-trade mechanism can greatly reduce the emission cost. The results of the study provide the research support for China in the international negotiations for the reasonable development space and the design of the international cooperation system.