Abstract:In this paper, it takes icing observations result which is the data of Xuefeng Mountain icing observation station from 2006 to 2013 in winter as sample. To census the temperature inversion days and distribution character of Xuefeng mountain region, it applies GrADS software to read and process the reanalysis NECP meteorological data. Basing on the observed data of Xuefeng mountain station, combing calculated results of reanalysis data, it makes probabilistic analysis of numbers of freezing days and temperature inversion days of Xuefeng mountain observation station. It also establishes the conditional probabilistic relation between freezing days and temperature inversion days. Concluding the general formula of freezing days and the empirical formula of Xuefeng mountain freezing days. Taking the icing observation station data from Hunan Xuefeng mountain, Sichuan Luohanlin, Guizhou Daxinzhai as verification sample, applying empirical formula to calculate the freezing days of each observation stations, the error range of calculated freezing days and observed freezing days is 0 to 0.8 days, and the freezing days formula is applicable well in certain conditions.