Abstract: The structure and the characters of wind velocity control system of D-4 low velocity wind tunnel at home having been built in Beijing University of Aeronautics and Astronautics was introduced. Due to the difficulties of establishing mathematical model, the complicated nonlinear characters and the change of parameters, the wind velocity systems is not easy to control in classical PID algorithm. This problem can be solved on the basis of parameters self-tuning fuzzy-PID control algorithm combined with expert decision. The experiment proved, compared with classical PID control, the parameters self-tuning fuzzy-PID control method can decrease the overshoot, enhance the capacity of anti-dynamic disturbance, have certain robustness, resolve the contradictory between rapidity and small overshoot, and is suitable for application in low velocity wind control system.