To further explore the responses of alpine soil ecological processes on snow cover and litter addition under the background of climate warmer,the effects of snow cover and litter input on 3 important soil enzyme (soil invertase,catalase and cellulose) activities were examined by PVC culture tubes method in the western Sichuan Plateau from Jan. 2011 to May 2011. The results showed that the snow depth played an important role in soil temperature and soil water content. 50 cm and over snow depth reduced the soil invertase and soil catalase activities,while didn't influence the soil cellulose activity significantly. Litter addition reduced the activity of soil invertase,while didn't affect soil catalase and cellulose activity obviously. It illustrated that the change of snow cover and litter input in non-growing season under the background of climate warmer may have a significant impact on soil biochemical process by changing the soil microbial activity.