Abstract: A cryogenic loop heat pipe（CLHP） using nitrogen as working fluid is developed for future aerospace application.CLHP is a kind of heat pipe that can operate at liquid-nitrogen temperature range and lower cryogenic temperature range.Without moving parts and complicated control,CLHP can provide effective thermal link and vibration isolation between cryogenic cooling sources and cryogenic components.A design of cryogenic LHP configuration and corresponding test system are presented.