Stability control is one of the core technologies of the photoelectric stabilized platform servo control. It is difficult for classical control way to deal with the conflict between the overshot and rapidity and to get satisfied dynamic performance. The system mathematical model for stability control was built, a self-tuning fuzzy PI controller was designed by combining the rapid response of fuzzy control with the steady state zero error of PI control, and the relation of the controller parameters was analyzed. Theoretical calculations and simulation analysis of the control system were carried out. The designed controller was realized by software on a digital platform based on DSP. Control performance test experiment of the control system was conducted. The simulations and experiments show that the new designed control system reaches the goal of zero overshot and rapid response.