The control system for the aero-acoustic wind tunnel is designed to reduce the noises of aircrafts, vehicles, etc. The subsystems are described, and according to the characteristics of control system, the key technical issues are analyzed. The closed-loop control of the test section pressure is realized by adjusting the fan motor speed. The model support mechanism is designed. The operations of the wind tunnel are completed by selecting the control flow according to the test configuration. The performance of control system is tested, and the results show that the control system can run steadily and reliably, and every performance has met or been better than the technical requirement.