Carbon nanotube (CNT) cathode based X-ray source is a leading field of X-ray CT technology in recent years. Compared with traditional thermal emission X-ray source, CNT X-ray source has characteristics of miniaturization, high resolution of time and programmable emission. Multi-beam X-ray source for stationary X-ray scanner is one of the most important applications of CNT X-ray source. In this paper, the development of CNT cathode based multi-beam X-ray source were introduced.