Based on the surface observation and sounding data in Changchun city from 2005 to 2014, this study analyzed the influence of air temperature at different altitudes on precipitation types in winter half year. The results show that the surface air temperature had a great influence on precipitation phase change, which could be well predicted by using 1.7 ℃ as a critical index to distinguish rain from sleet, and -0.1 ℃ as a critical index to distinguish sleet from snow. The method of combining surface temperature of 2 m with upper air temperature of 925 hPa was more accurate in judging precipitation types. The faster the surface temperature increase or decrease near 0 ℃, the shorter the duration of sleet.