A visual tracking system driven by ultrasonic motors is designed.The image from video camera is processed and the target is identified.The system can track the target by fuzzy-PID control method in real time
through the feedback of its position information.Experiment results show that the compound control method applied to ultrasonic motors can make the tracking system have good performance.Its rapidity is within 0.2 s and position precision can be implemented within ±6 mm.