Abstract:Using 500 hPa average circulation signal field and average temperature signal field, we analyzed the circulation abnormal characteristics of the first 40 major cryogenic rain and snow processes. The results showed that (1) This method that uses cold and wet index to select process has the function of assessing the influence degree cryogenic freezing rain and snow in Guangxi. (2) Most signals of the 40 cases have strong area and strong signal reflection, having prominent positive anomalies. The anomalies are usually represented by a positive system in the high field, known as the ridge. The development of high latitude ridge in winter is usually combined with the strengthening of cold advection. Cold air accumulation is the key to the continuous freezing of low temperature rain and snow in Guangxi. (3) The signal field analysis can be divided into three categories. The weather system and its performance can be understood after the analysis of the signal field and high average field. The key areas and key systems for the cold and snow freezing weather in Guangxi are the Ural ridge and the front of transversal trough, the Baikal ridge and the front of northeast transversal trough, and the small trough in northwestern Xinjiang.