Abstract:Climatic characteristics and changes of glaze days in China were analyzed with the daily glaze observational dataset at 2426 stations in China from 1954 to 2017. China’s glaze mainly occurs in Xinjiang and the parts east to 103°E of China. There are three major glaze zones: the area cross the borders of Shaanxi, Gansu and Ningxia provinces, the area of Henan and eastern Hubei provinces, and the area of Jiangxi, Hunan and Guizhou provinces, of which the third area is the central area, with 5-50 glaze days per year in average at every station. The 128 glaze days when glaze occurs in Mountain Emei at an altitude of 3 〖KG-*5〗047 meters are the most in China. In the glaze region south of the Yellow River, the glaze days at the stations with altitude more than 1 〖KG-*5〗000 meters are possibly more. The glaze occurs from September to May of next year, showing a peak pattern distribution with a beginning of glaze mainly from winter season when the cold air is the most active from January to mid-February. The probability of number of glaze days has obvious interdecadal variation characteristics, and it is significantly higher during the first 26 years than the latter 30 years during 1961-2016. From 1961 to 2016, the total number of glaze days in China is decreasing, and the area of glaze is significantly reduced since 1990 except for the main area of Guizhou and Hunan provinces.