The winter in 2021-2022 is expected to be cold, mainly due to this year or &”;La Nina year&”;, which means that the probability of cold winter in the south will be higher than that in the north, so extreme cold will easily occur. La Nina often appears alternately with El Nino, but the frequency is lower than El Nino. When La Nina phenomenon appears, China is prone to cold winter and hot summer, so the winter in 2021 is expected to be cold winter.