▎ 摘　　要

Based on the density of the general theory, the structures of ziqzag graphene nanoribbons (ZGNRs) (N=17, N is the number of carbon chain) with nanoholes are optimized and then get the transport property of the electrons in these systems with different holes through the calculation. The results show that the conductance is not only related to the quantum confinement effect, but also confined by the symmetry of the hole and the configuration of the diagonal symmetry is larger than the longitudinal symmetry' s in the presence of a single-hole. In the case of two holes, the conduction of the system is advanced with the growth of the distance between the two holes because of the coupling effect. At the same time, we can get some quantum phenomenon which can be explained by the model of one-dimensional double barrier.