Abstract: For problems of low efficiency, low precision and poor correctness of mine-used airflow detecting methods by use of mechanical or electronic air meter, meter ruler and leather ruler, the paper proposed a design scheme of mine-used airflow detector with multi-parameter measuring function and introduced component, detecting principle and software design of the detector. The detector adopts ultrasound probe and ultrasound time-difference method to measure air speed in tunnel, uses laser impulse method to measure distance between the detecting point and tunnel wall for calculating cross-sectional area of the tunnel, and gets airflow value by multiply calibrated air speed by the cross-sectional area of the tunnel. The testing result showed that the detector can quickly measure airflow in mine tunnel with high precision. The next work is to test correctness of the detector underground.