It is found that under little axial strain,armchair carbon nanotubes are still conductors,but Fermi wave vector,Fermi dot and the effective mass near Fermi face are changed.

• 在小的轴向拉伸下,扶手椅型碳纳米管仍然是良好的导体,但其费米波矢、费米点及费米面处的有效质量都发生了变化。