A scheme of nanoscale lasers based on the so-called carbon peapods is examined in detail.Since there is considerable cylindrical empty space in the middle of a single-wall carbon nanotube (SWCNT),it can serve as a laser resonant cavity that consists of two highly reflecting alignment "mirrors" separated by a distance.These mirrors refer to ordered arrays of C60 inside SWCNTs,which have photonic bandgap structures.Meanwhile,ideally single-mode lasers are supposed to be produced in the nanoscale resonant cavity.