Recently, the cold wave has brought "cliff like" strong cooling and large-scale rain and snow. Zhou Bing, chief expert of climate service of the National Climate Center, said that it is against the background of global warming that the frequency and intensity of extreme weather events such as high temperature heat wave, drought, flood, typhoon and cold wave have increased. Global warming leads to more unstable climate, and the intensity of extreme cold events is increasing. In addition, Arctic warming is also an important reason for the occurrence of extreme cold weather. It is expected that the cold air activity will be significantly strengthened from January to February next year. The temperature in most parts of central and eastern China may be lower than that in the same period of the year, and there is a high possibility of periodic extreme cold wave events. All localities need to continue to guard against the adverse effects of low-temperature weather, do a good job in the dispatching and supply of energy such as coal, electricity, oil and gas, do a good job in the guarantee of spring transportation, and strengthen the fire prevention of forests, grasslands and urban and rural areas.