Abstract: Abstract： A new conception of CNT (carbon nanometer tube) baffle is presented by increasing the absorptivity of the absorption coat to decrease the baffle outline size and mass, and to enhance the stray light rejection ability. A series of technologies to outgrow CNT coat with absorptivity of 99% more on the Ti alloy base are developed and applied on the new CNT baffle being capable of displacing the current product technology. The space environment applicability of the CNT baffle is demonstrated by a series of ground space environment simulation tests such as atomic oxidation, ultraviolet radiation, highenergy particles radiation, vibrancy mechanics, thermal vacuum, and so on. Comparing the star tracker image values caused by the stray light with the current normal star tracker baffle, the value with the CNT baffle is reduced by 56%, which indicates the advantages of the CNT baffle in stray light rejection. The innovation success shown in this paper breaks through the bottleneck technologies about the practical application of carbon nanometer tube technology in the stray light rejection technical domain, and has important engineering value for the star tracker technology progress.

Key words: Keywords：star tracker, carbon nanometer tube, baffle, stray light rejection