Terahertz (THz) technology is now becoming more important with the potential applications in biochemical sensing, security detection, and high-speed communication. However, because of lack of active materials for THz wave, wave control, e.g. intensity and phase distribution, is still challenging. Plasmonic metamaterial has opened up a new avenue to manipulate electromagnetic wave at will [1]. Unique wavefront control has been also demonstrated by a metasurface, which is a tailored surface structure, to introduce unusual phase discontinuity at the interface [2-5]. Here, we propose a novel plasmonic metasurface made of graphene ribbons to control the wavefront of THz wave.