Aiming at performance requirements of electro-optical tracking servo-system increasing and the lack of traditional control method, the parameter self-regulation fuzzy PID (proportion, integral and differential) controller is used in the position control loop for servo-system .The structure and design principle are analyzed, and the parameter self-tuning fuzzy PID algorithm is also introduced. Based on the ARM7TDMI 16/32 bit RISC S3C44B0X processor platform produced by Samsung company, the controller is build from hardware and soft? ware. The controller has adaptive capacity, better control quality and robustness, so that the electro-optical track? ing servo-system has the advantages including the quick response, smooth transition process and short condition? ing time. It provides some references for the practical application in the field of optoelectronic.