Abstract: In order to measure instantaneous rotation speed， the rotation speed of the shaft in the spatial coordinate system is investigated and the measurement model for measuring instantaneous rotation speed of rotation mechanism is proposed. A novel system for measuring the rotation speed is designed based on linear CCD and the realtime processing of measurement data is carried out by threeorder structure. The test results show that the deficiencies of the instantaneous rotation speed measurement in the instantaneous characteristic analysis of rotation mechanism were solved. A simple speed compression model was build up and the reference for other speed measurement applications was provided.