Abstract: The acoustic measurement system is an important component of the in 5.5m×4m large-scale low-speed aeroacoustic wind tunnel,which is mainly used to accurately identify the ar-ea upon the test model where the aerodynamic noise is generated and measure the background noise of the wind tunnel under different conditions.According to the current status of the acous-tic measurement technology at home and abroad,combined with the specific requirements of aeroacoustics test,a high performance acoustic measurement system has been developed to per-form accurate measurement of aerodynamic noise source location and wind tunnel background noise.Test results show that the measurement system can meet the test requirements in the acoustic wind tunnel.Distributed structure greatly improves the reliability and SNR of the sys-tem.Plug and play technique effectively reduces the construction,configuration and programming work to improve the flexibility and configurability of the system.Multi-threaded parallel processing algo-rithm and TDMS technology can realize the real-time streaming data up to 153.6MB/s,and the packet storage technology provides a guarantee for the orderly storage and fast retrieval of massive data.