The Younger Drays event is a cold event that occurred during the last deglaciation, which has a significant impact on climate change in the mid-high latitudes of the Northern Hemisphere. However, under the unified understanding of the cooling in the mid-high latitudes of East Asia, there is still a lack of understanding of its seasonal characteristics. In this paper, the stomata, pollen, total organic carbon, delta~(13)Corg and grain size records from the time interval 15. 0 ~ 10. 8 ka B. P. ( corresponding to 545 ~ 731 cm depth in the lake sediment core) of the last deglaciation of Lake Moon (47°30'25"N, 120°52'05"E) in the central part of the Great Khingan Mountains area were presented. The results show that the influx of Larix stomata increased, the pollen percentage of deciduous broad-leaved decreased versus steppe increased from 11. 8 kaB.P. to 12. 8 kaB.P., which reveal that the composition of the boreal coniferous forest in the Greater Khingan Mountains area increased, the forest developed during the Younger Dryas event. Compared to the Bolling-Allerod warming and the Early Holocene, the values of total organic carbon from Lake Moon from 11. 8 ka B.P. to 12. 8 ka B.P. are medium, the values of delta~(13)Corg are lightest and the values of grain size are finest. These results also support that the environment did not deteriorate during the Younger Dryas event in study area, which imply a moderate summer. The comparison with other records in East Asia shows that the winter temperature decreased, and the East Asian winter monsoon increased significantly during the Younger Drays event.