Abstract: With the development of the aviation industry, the aircraft performance is improved, But Low-level wind shear is still a threat to aviation safety. The characteristics of four low-level wind shear events at Kunming airport in February 23, 2017 were analyzed. The analysis found that, the special geographical location caused by the cold front speed is slow, the cold front, at both ends of the runway appeared in the wind direction and velocity discontinuity, caused by wind speed and direction at both ends of the runway are unable to meet operating standards, resulting in the runway closed, after the cold front, 60 m decision height is formed the strong vertical wind shear, causing the plane go around, resulting in a greater impact on flight safety.With automatic observation system and wind profile radar can better understand the characteristics of a Low-level wind shear, also provide more sophisticated services for aviation safety.