The intensity, location and phase transformation of two snow and rain freezing processes in Yueyang, Hunan province in January 2018 were compared and analyzed by using live observation data, dopler radar, NCP/fNL global reanalysis data and EC fine grid numerical forecast data. The results show that:①The cold air South merges with the middle and lower layers of warm and humid air in the central and Eastern areas, and with the influence of the southern branch trough, it is the main reason for the freezing weather of the two rains and snow in Yueyang City; ②In these two processes, the precipitation(snow) period corresponds to the vertical upward movement area, and the influence on the precipitation phase is mainly the vertical temperature layer junction; ③An inversion layer greater than 0 ℃ appears in the middle of 800 hPa to 700 hPa, mainly rainfall or frozen rain, while when the entire layer temperature is lower than 0 ℃, snowfall is the main cause; ④In the two processes, the EC fine grid prediction is relatively good in the starting and ending forecasting of process precipitation, and the conversion time and magnitude of rain and snow are relatively accurate.