Snow disaster in pastoral area is a meteorological disaster which due to snowfall and snow covers, in relation to cowman’s product and life, seriously affects development of animal husbandry in China. So it has been paid high degree attention in the field of disaster prevention and reduction. Risk warning of snow disaster is an effective way to reduce the loss. Space technology, as an important way to monitor snow cover in pastoral area, could be used in risk warming of snow disaster. In this article, based on interpretation of remote sensing image, combined with geo-spatial, meteorological and land use data, research on three indicators have been carried out, which are: possibly degree of buried graze by snow, continuous days of perpetual snow and rate of perpetual snow, model on risk warning of snow disaster has been set up successfully. Case analysis in Inner Mongolia during 2012 shows that: the proposal model has a high precision and could be used in risk warning of snow disaster in pastoral area.