Abstract: In order to further improve the air volume measurement accuracy of coal mine ventilator and master the air flow situation on site, in view of the air volume measurement problems and requirements of Xinzhouyao coal mine circular air tunnel, based on the principle of air volume measurement by wind speed method, it is concluded that the corresponding wind speed measurement error with and without support is 4.4% through a large number of tests; and the wind speed error compensation formula is obtained by using the least square method. The air volume test system is designed with KV621-02 wind speed sensor and PCI-6225 data acquisition card as the core. After testing, the test system can reduce the measurement error of wind speed by 0.17 m/s, and the minimum relative error of final air volume test is only 0.12%. The designed air flow measurement system can be popularized and applied in practice.