; Zhang Hai-Qing] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
; [Zhang Hai-Qing] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
; [Guo Han-Ying] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
A new gravitational model for dark energy is presented based on the model of de Sitter gauge theory of gravity. In the model, in addition to the cosmological constant, the homogeneous and isotropic torsion and its coupling with curvature play an important role for dark energy. The model may supply the universe with a natural transit from decelerating expansion to accelerating expansion.