▎ 摘　　要

Using density functional theory with the generalized gradient approximation, we investigate the electronic structure of graphene with uniaxial tensile strain in terms of its direction and homogeneity. A uniform strain does not affect the conical dispersion band of pristine graphene but simply shifts its position in the two-dimensional Brillouin zone. Graphene with periodic tensile strain along the armchair and chiral directions is a semiconductor with a tiny gap of a few meV, which is slightly dependent on the strain direction.