Abstract: Using meteorological observation data, NCEP data and GDAS data, combined with HYSPLIT model, the atmospheric circulation and water vapor transport characteristics of heavy snowstorm in northern Hubei from 3 to 4 January 2018 were analyzed.The results show that:1) The 100 hPa polar eddy splits to the northeast of Asia, the position of the polar front jet is southly, there is Ural Blocking situation at 500 hPa and the East Asian trough is eastern and stronger, it’s conducive to conveying strong cold air to the central and eastern part of China; the 700 hPa southwest jet and 850 hPa cold pad provide favourable conditions for dynamic condition, water vapor condition; the surface cold anticyclone is stronger, come from east and constantly replenishing, it’s advantageous to keeping snowfall for a long time.2) The high value of whole layer vapor transportation fluxes extends from south China to the Yangtze River region.Water vapor transport intensity and water vapor convergence are stronger than perennial in northern Hubei.The four water vapor transport routes are 650 hPa dry and cold air in the Yellow Sea to transport water vapor from northeast, with the second contribution rate of water vapor.Water vapor from the Bay of Bengal is transported to snowstorm area by 650-700 hPa air, with the first contribution rate of water vapor.500 hPa dry and cold air comes from the west, and the contribution rate of water vapor is the least.Near-surface warm and wet air conveys South China Sea vapor from the south to the snowstorm area, with the third contribution rate of water vapor.Compared with the normal snowfall, the transport path to the south is increased, and the water vapor with the first contribution and second contribution is higher.