A new type of sun tracking system based on ARM 32 bit Microprocessor S3C2440 (produced by Samsung) is introduced. The solar altitude and azimuth calculated by the system is used to drive the motor, then combine with photoelectric sensor to track the sun precisely. And the manual control is designed to make the system maintain convenient. The tests show that the tracking control system can reach the expected targets and has great practical value for the improvement of solar energe utilization.