Abstract:The paper has validated and discussed the mechanism about a strong low-level wind shear appeared on August 6, 2015 in Hefei based on Hefei ground observation data, Automatic Weather Observing System (AWOS) of airport, Doppler radar data, sounding balloon and 0.25°×0.25° FNL data. Main conclusions are as following. The unstable energy and upward flow were rather strong which is beneficial to the development of the convection in Feixi county before low-level wind shear happening. The ground observation data measured that wind speed, wind direction as well as temperature changed rapidly near the ground when low-level wind shear occurs. At the same time, the quick dropping of the height of center of mass, the height of the strongest echo and the top height about the storm indicated that the air flows declined fast and diverged to all around as soon as they reached the ground. So this storm belonged to the characteristic about downburst. What's more, positive-negative velocity verified the strong wind speed and direction shear near the ground.