Effective excitation control of generator is one of the main techniques to improve the dynamic performance of power system. In this paper, a fuzzy PID control scheme is proposed based on the feedback signals of voltage and angel velocity. In order to increase the adaptability for the dynamic conditions, PID parameters are achieved by fuzzy inferring. The fuzzy inferring rules are designed, and the adaptive control parameters are gained for the single-machine infinite system. Simulation results show that the proposed control method in this paper has better robustness against the dynamic disturbances.