The power drift of pump source and amplified spontaneous emission(ASE) noise are the main factors that result in the fluctuation of output power of superfluorescent fiber source(SFS). In order to obtain a stable output power of the SFS, a novel hybrid controller is designed, which combines the digital fuzzy control with the analog proportional control. Because both the high and low frequency noises can be constrained by the hybrid controller efficiently, the stability of output power of the SFS is clearly improved. The experimental results show that, with the hybrid controller, the short-term stability of output power of the SFS is ±0.032%(±0.0014 dB), and the long-term stability of that is ±0.041%(±0.0018 dB).