Abstract: Based on the precipitation data of Benxi during October to April in 1981-2013, the climatic characteristics of precipitation phase in the winter-half-year were analyzed. The results showed that the conversion between snow and rainfall usually happened in March and November. The analysis of atmospheric stratification based on sounding and automatic station data in winter-half-year during 2005-2013 indicated that different precipitation phases corresponded to different heights. When it was snowing, both the upper and surface temperatures were under 0℃; when it was raining, the height of 0℃ level was between 850 hPa and 700 hPa; during the conversation of rain and snow, the height of 0℃ level was close to 925 hPa. In this situation, the temperature range at 700 hPa was -11℃ to -7℃, at 850 hPa was -6.5℃ to -1.5℃, at 925 hPa was -3℃ to 1℃, and at 1000 hPa was 0℃ to 3℃, and the surface temperature was lower than 1000 hPa temperature. The results of this study will be useful for Benxi, the eastern mountainous areas of Liaoning and some areas of Jilin to forecast the precipitation phase.