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Synthesizing graphene nanoribbons (GNRs) with smooth edges and controllable widths is a prerequisite for many graphene applications.[1] By employing ab initio calculations,we proposed two efficient methods of making narrow GNRs:i) Using a single transition metal atom as the chemical scissor to unzip single-walled carbon nanotubes (SWNTs) into GNR in H2 gas;[2] ii) applying an external uniaxial strain to cut graphene sheet into GNRs upon oxidation.[3] The transition metal atom can drastically reduce the energy barrier of unzipping SWNTs,showing the feasibility of synthesizing high-quality narrow GNRs at only slightly elevated temperatures (～400K).