Abstract: By using the southwest vortex dense sounding data and wind profile radar data achieved in Southwest Vortex Dense Observation Experiment at Mingshan Station in Sichuan Province from 2015 to 2017, the difference between the two data in the detection of low-level wind in the troposphere are compared and analyzed. The results show that the effective detection height of the wind profile radar data at Mingshan Station is about 4200m. The shape of wind profile measured by wind profile radar and sounding is generally close. The deviation of wind speed between wind profile radar and sounding is small, and the deviation is large only at individual levels and times. There is a positive correlation between the wind speed deviation and wind profile wind speed. Except for a few cases, the wind speed measured by wind profile radar is greater than that measured by sounding. The variation of wind direction difference with height is opposite to that of wind speed, which is smaller in the middle and high levels, and larger in the low level. Except for the 500m altitude layer in the early morning, the main wind direction observed from the lower level to the upper level changed from the northeast wind to the southwest wind with good consistency. The distribution of U-wind and V-wind scattered points mainly presents a hammer-shaped distribution along the diagonal, and the quality of V-wind is better than that of U-wind. The U-wind detected by wind profile radar has obvious systematic positive deviation relative to the sounding data in the night period. Precipitation has a great influence on wind profile radar detection height, when there is precipitation in the morning and at noon, the detection height is significantly higher than that without precipitation.