Abstract:The characteristics of atmospheric stratification of freezing rain process in early 2008 is analyzed,the stratification condition in Guiyang, Nanchang and Nanjing is diagnosed. The result indicates that the favorable condition for the freezing rain is the temperature inversion, warm layers in the lower troposphere, and the temperature on the ground surface must be less than 0 ℃. A regional climate model (IPRC-RegCM),developed at the International Pacific Research Center (IPRC), is utilized to simulate this rainfall event, which was divided into three stages, and then, the model output is used to analyze the mechanism for the maintenance of temperature inversion. The results are as follows: the numerical model can reproduce the distribution of precipitation band; the tops warming of temperature inversion during the first stage is affected by horizontal advection and latent heat of condensation, but during the next two stages, the tops warming is mainly maintained by warm advection ; the bottoms cooling of temperature inversion is sustained by the cool advection and adiabatic cooling.