Abstract: Using ERA-20C reanalysis data and the daily snow depth data of 16 sites in Hulun Buir from 1981 to 2010,the differences between ERA-20C snow data and observation data were analyzed.The results showed that ERA-20C reanalysis of snow depth data and Hulun Buir station data were consistent,can be better to reproduce the observed snow depth of the temporal and spatial trends,and the correlation coefficient of the observation passed 99.9% of the reliability test.In the agricultural area,pastoral areas in winter and spring were high estimates;agricultural area relative deviation was larger;but forest area in winter showed a low estimate.