The East Asian winter monsoon and the Siberian high were both stronger than normal during the 2018/2019 winter. For geopotential height anomalies at 500 hPa in Northern Hemisphere, the Ural Mountain Area was positive anomaly, and Baikal Lake-Barkash Lake Area was negative anomaly. The mid-high latitudes of Eurasia were mainly dominated by meridional circulation. In winter 2018/2019, the cold air processes occurred frequently and the intensity was strong. The temperature in the northeastern, southwestern and central and eastern parts of South China were higher than normal, but the other parts were on the low side due to the influence of the cold air processes. In addition, the intraseasonal variation of circulation of the mid-high latitudes of Eurasia was significant, which leads to the periodic characteristics of temperature anomaly in China. The lower concentration of sea ice in the Barents Sea and Kara Sea in the early autumn is the main reason for the strong East Asian winter monsoon.