To analyze the spatio-temporal distribution , meteorological elements , ice thickness , and atmospheric stratification characteristics of the freezing rain weather process in Guizhou Province from December 13 to 21 , 2020 , by using the minutely observation data of temperature , relative humidity , wind speed and precipitation amount from 84 national automatic weather stations in Guizhou Province , the observation data from freezing rain gauges at the Meihua Mountain , Kaiyang and Wanshan stations , and the sounding data from Guiyang and Weining stations , this article analyzes the spatial and temporal distribution , meteorological elements , ice thickness , and atmospheric stratification of this freezing rain process by means of the statistical analysis and cloud top calculation methods . The results show that : ( 1 ) This freezing rain event mainly occurred in the western , central and southeastern parts of Guizhou with an average temperature of - 4 to 0℃ . Among them , the freezing rain in Meihua Mountain lasted for 9 days , and the hourly maximum accumulated ice thickness reached 0 . 8 mm. ( 2 ) The formation mechanism of this freezing rain process was the warm rain mechanism. (3) During the main process of freezing rain , there was a good consistency of freezing rain observation between the freezing rain measuring instruments and the manual observation . (4)The freezing rain measuring instrument at Kaiyang Station observed that the start time of freezing rain was 21 min earlier than the estimation for which wind speed was increased to 0 m · s - 1 . In Kaiyang , the minimum temperature was - 5 . 1℃ , the maximum wind speed was 5 . 1 m · s - 1 , the minimum relative humidity was 85% , the maximum daily precipitation was 1 . 4 mm and the maximum accumulated ice thickness was 3 . 27 mm. The daily ice accumulation period was divided into two stages . The temperature in the ice accumulation mainly maintained at around - 3 . 1℃ , with the average wind speed being 2 . 2 m · s - 1 and the relative humidity ≥ 98% . In conclusion , the freezing rain measuring instrument can observe the start time , ice thickness , and end time of freezing rain , and can provide services for winter freezing rain forecasting in Guizhou province .