Abstract: This paper introduces the profile and movement principle of two terry mechanisms on HGA732T range terry rapier looms.The differences,advantages and drawbacks between two terry mechanisms are compared based on their mechanism constructions and functions.The movement parameters and dynamics parameter are discussed starting from the terry mechanism design and the law of motion.In combination of practical experiments,some key factors influencing the performance of towel loom are presented,thus providing a basis for further optimizing the mechanism as well as a reference for designing other terry mechanisms.