The oil temperature control of a airplane hydraulic energy system demand higher accuracy,this type of aircraft hydraulic source has characteristics of high power, big flow and large volume of tank. This is an oil temperature control system with larger hysteresis, nonlinearity and time-varying. Considering the feature of this system, a fuzzy parameter self-tuning PID controller was designed. The simulation was done by using the MATLAB/FUZZY tool box. The simulation results show that the controller has better dynamic and robustness than traditional PID controller. Experiments show that the algorithm is implemented on the hydraulic oil temperature at 60±2℃ precise control in 250 s, the controller has better effect in oil temperature control of this type of aircraft hydraulic source.