Followed by the development and melting of snow cover,soil temperature,soil moisture and soil freeze-thaw cycles fluctuated drastically in the seasonal snow-cover region in winter,which dominates the survival of soil microorganism and the change in microorganism communities,that plays an important role in the transformation on soil mineral elements,soil nutrient supply and plant distribution.A large number of studies have shown that soil microbe community exists obvious seasonal change,which dominated by bacteria in summer,whereas,fungi in winter.Microbial growth and activity is limited by available C in late winter.The change of snow depth and litter supply under the background of climate change will have an effect on soil C level,cause the dynamic shifts of microorganism,thus will play a key role in soil nutrition cycle.This is also one of the new directions in the field of study.