Abstract: Precipitation,temperature,wind speed are meteorological factors forming the snow.The perpetual snow has an adverse impact on the animal husbandry in certain degree,because of the vulnerability of the Qinghai-Tibet Plateau to the snow.Factors causing calamity,calamity environment and animal husbandry were analyzed by using theory of calamity study step by step to identity the function and interaction among the factors.Therefore,the gradual differentiating model for snow calamity was established,supported by database of GIS.The model included some factors,such as precipitation,perpetual snow,causing of disaster,assessment of calamity,which were monitored and evaluated finally.From beginning of precipitation,the snow calamity development trend was monitored.Potentially the model could be used in the routine operation for the disaster assessment.

Key words: Snow calamity, Snow calamity, Assessment, Fuzzy, Monitoring, Gradually