Based on the analyses of lasting disaster weather of freezing rain and snow over South China during the January of 2008,the catastrophic flood over the Changjiang River basin during the summer of 1998 and the severe drought in Yunnan Province during the winter of 2009/2010,this paper emphasizes again that the combinational anomalies of atmospheric circulation system play important roles to the little probabilistic extreme weather and climate events.For the lasting disaster weather of freezing rain and snow in 2008,the combinational multiple circulation anomalies are clear,including Ural blocking high and a trough from Lake Baikal to Lake Balkhash that offer condition for continual cold air pouring southward from the west passage,and positive geopotential height anomalies over the eastern Asia and Japan that weaken the force of cold air from the north.Thus the front stays longer time over the South Mountain and its north area,which establishes background for continuous raining.Meanwhile,the Northwest Pacific subtropical high extents westward and its intensity also enhances,baring the cold air.The persistent strong Indian-Myanmar Trough and Northwest Pacific subtropical high transport warm and wet air to South China,and it is favorable to the occurrence of continuous rain.Persistent cold air activity and precipitation induce persistent low temperature,which creates conditions for the freezing weather.For the catastrophic flood over the Changjiang River basin in 1998,the combinational multiple circulation anomalies include the southwest monsoon surge,the Northwest Pacific subtropical high and cold air activities in summer,combined with the eastward propagation of convective system of the Tibetan Plateau.For the severe drought in Yunnan Province during the winter of 2009/2010,the combinational multiple circulation anomalies include that the Middle East subtropical jet at upper troposphere weakens,which influences Rossby wave and is unfavorable to the formation of the Tibetan Plateau-Bay of Bengal Trough;The Northwest Pacific subtropical high intensifies and shifts slightly southward,which inhibits the lower-level water vapor transmission into Yunnan;Teleconnection wave train anomaly caused by negative anomaly of NAO makes the cold air activity in the northeast of East Asia locate to the east and be difficult to reach the Yunnan region.It also makes the southern branch trough weak,and the warm and wet air could hardly reach to the Yunnan region.Generally the ENSO has a very important impact on weather and climate variations in China,but the influence is not same in every time and every region.The specific impact of ENSO must be analyzed case by case in order to determine its exact role in anomalous events,especially extreme weather and climate events.