▎ 摘　　要

I perform a theoretical study on transport properties for electrons through a defect-containing graphene strip sandwiched between semi-infinite electrodes. The electron transport properties of graphene strip vary depending on the type of defects and the transport direction. The pi states of carbon atoms play the main role in the electron transport, while the sigma states also contribute to the transport through a graphene strip with a vacancy. Additionally, for armchair-direction transport, the paths of electrons flowing through graphene strips with a doped atom are much affected by the existence of impurity compared with those for zigzag-direction transport.