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Weather conditions for airplane icing and icing characteristics in the low level flight are analyzed on the basis of the FNL data, with the temperature measurements (OAT) and observations from 7 icing reports during the winters of 2015 and 2016 The results show that when the plane flies at the low levels in the winter in the Sichuan Basin, there are four types of circulations conductive to aircraft icing, including cold front, low trough, the southwest flow and weak ridge type, and the former 3 types are more beneficial to moderate icing. The seven cases show that the aircraft icing was formed in the clouds with the temperature below zero; the moderate icing formed in the temperature range of -2 to -4 ℃; the light icing was in the range of 0 to -1 ℃. Besides, the greater the relative humidity was, the more conductive to the formation of ice, and the moderate icing is more likely formed when the relative humidity is more than 90%. Under the beneficial circulation background and certain scope of temperature and relative humidity, the updraft speed between -005 to -10 Pa〖DK〗·s-1 is more conducive to moderate icing, while the range of 0 to -005 Pa〖DK〗·s-1is more conducive to mild icing.