November　25,　2009,　the　Chinese　government　officially　announced　the　action　to　control　greenhouse　gas　emissions　targets,　2020　carbon　dioxide　emissions　per　unit　of　GDP　decreased　40-45%　compared　to　2005,　Non-fossil　fuels　in　primary　energy　share　to　about　15%.　Based　on　the　objectives　of　carbon　dioxide　emissions　per　unit　of　GDP　decreased　40-45%　to　2020,　this　paper　analized　the　intensity　of　carbon　dioxide　emissions　per　unit　of　GDP　of　the　main　drivers,　reveals　the　quantitative　relationship　among　the　carbon　intensity　of　quality　of　economic　growth,　energy　efficiency　and　optimized　the　energy　structure.　Finally,　the　paper　predicted　China＇s　future　energy-saving　targets　in　carbon　emissions　constraints.