Scenario is an important tool for climate change projection.The Intergovernmental Panel on Climate Change (IPCC) developed the Shared Socioeconomic Pathways (SSPs) in 2010, aiming to scientifically support the Fifth Assessment Report (IPCC AR5), Coupled Model Intercomparison Project (CMIP), Inter-Sectoral Impact Model Intercomparison Project (ISI-MIP), and other international programs.As climate scenarios developed from a socioeconomic perspective, SSPs facilitate climate change research including physical science, impacts, vulnerability, risk, adaptation and mitigation.In this paper, we first describe the development process of SSPs and their possible application.Next, the simulation and global and Chinese results of population and economy, land use, energy and carbon emissions are simulated and projected.In particular, the carbon emission trajectories under different SSPs and their relationship with the "two-carbon" target are also quantified on scales for both the world and China.Finally, a prospective application of SSPs is presented.