Abstract: Based on the glazedata collected at 89 meteorological observational stations in Hunan, NCEP/NCAR reanalysis data, monthly mean sea surface temperature data from Hadley Centre from 1961 to 2018,the influence of Pacific SST anomaly in the early stage on winter glaze in Hunan province were analyzed. The results showed that,there was a significant positive correlation between the distribution of positive and negative dipoles in the Pacific SST in the early July-September period and the number of winter glaze days in Hunan. When the SST index is on the high side, the westerly jet to the north of the Yangtze River at 200 hPa in the late winter was stronger, the geopotential height near the Ural Mountain at 500 hPa was higher, the geopotential height at the middle and high latitudes in East Asia was lower, the sea level pressure in Siberia was stronger, the cold wave activity was more, and the number of glaze days in winter in Hunan was more; on the contrary, the number of glaze days in winter in Hunan was less.

Key words: Pacific SST, glaze in Hunan, physical mechanism