A rotary workpiece measurement system that has a combination of contact and non-contact measurement scheme is introduced.The application of telecentric lens in non-contact measurement is analyzed.The structure of rotary workpiece measurement system and the measurement scheme are introduced.The characteristic parameters of rotary workpiece are discussed.The non-contact measurement method should be used as much as possible in order to improve the measurement speed.Telecentric lens and parallel light are used in experiments.The result indicates that the parallel projection of telecentric lens can effectively solve the problem of the contour interference of rotary workpiece plane features.