Using the hourly reanalysis data of ERA5 0.25°×0.25° and the No. 1 wind profile radar data of Beijing Daxing International Airport, the multiphase precipitation process of Daxing Airport on November 6-7, 2021 and February 11-12, 2023 was compared, and the performance characteristics of wind profile radar on winter snowfall were explored.The results showed that:(1)The establishment of easterly winds near the ground wind field of wind profile radar, the emergence of jet streams and the disturbance at medium and low altitudes all play a positive role in the forecast of winter snowfall, the enhancement of cold air in the lower layer has certain indicative significance for phase transition, and the strength of warm and humid uplift in the middle and upper layers has a good correspondence with the change of precipitation intensity.(2)Both precipitation intensity and precipitation phase changes can be reflected in the vertical speed detected by wind profile radar. The rainfall period of the two processes has a large positive velocity below 2500m, and the vertical velocity decreases sharply with the change of precipitation phase from rain to snow.(3)The structure of atmospheric refractive index constant Cn2 and signal-to-noise ratio (SNR) echo structure are similar, and both of them can reflect the change of precipitation intensity.The logarithmic value of Cn2 in both processes began to increase one hour before the start of precipitation, and the higher the Cn2 value, the more intense the precipitation, and the height range of the high value area gradually increased with the phase change from rain to snow.The high SNR value area of the two processes is mainly concentrated below 2000m, and the tighter the SNR structure and the greater the echo intensity, the more intense the precipitation.(4)The radar detection altitude is directly affected by the humidity in the upper atmosphere, which can provide a basis for judging the intensity of precipitation.