A method for making a strip shaped graphene layer includes the following steps. First, a carbon nanotube structure on a surface of a metal substrate is provided. The carbon nanotube structure includes at least one drawn carbon nanotube film. The at least one drawn carbon nanotube film includes a number of carbon nanotube segments, each of the number of carbon nanotube segments being substantially parallel to each other and separated from each other by a strip-shaped gap. Second, carbon ions are implanted into the metal substrate through the strip-shaped gaps. Third, the metal substrate is annealed to obtain the strip shaped graphene layer.