Abstract: Several rainfall and snowfall synoptic processes occurred subsequently in Leshan in January-February, 2008.During the process the number of days with average temperature below 3℃ and the number of persistence snowfall days, both broke the historical records since 1951.This article analyzes the circulation features of the disaster weather and climate events in 2008, and compared the process with similar ones in the history (1977, 1984 and 1996). The results suggest that both 2008 case and the historical cases share the following circulation features:a southward shifted polar vortex (PV), a east-west orientated trough spanning Lake Balkhash and Lake Baikal, a long-term persistent Mongolian Cold high, an enhanced west Pacific subtropical high (WPSH), and an active southern Tibetan Plateau trough (STPT).In comparison, the intensified NWSH, the active STPT, and the southward shifted PV are most significant in 2008.At last, we consider that both the La Nina event beginning from August 2007 and the lower solar activity in 2007 play a role in forming these rainfall or snowfall processes through the analysis and discussion.