The closing and creeping displacement changes of the switch rail that as the weak link of railroad turnout are related to the safety of the train，which requires regular detection and strict control. For this purpose，both method and system for measuring closing and creeping displacements are developed. The system uses a motion guide rod to convert the closing and creeping displacements into linear and small angular displacements. Moreover，a calculation model for closing and creeping displacements and a calibration method is established. A dedicated data acquisition and transmission circuit is developed to realize the collection and monitoring of the closing and creeping displacements. The experimental results show that the measurement error is less than 0.2 mm，which meets the requirement of high-precision measurement for the closing and creeping of switch rail.