Firstly,the circulation evolution features of snowstorm in Inner Mongolia in last 50 years is analysed.It is pointed out that barber,heavy snow and severe detemperature do together damage to human and animals more seriously in company with freezing disaster.They are the main factors of disaster formation.Strong jet,stronger frontal zone and strong divergence in upper air along the coast of north China become beneficial factors of vapor travelling from south to north.These factors promoted the formation of snowstorm in Inner Mongolia.Lastly,several circulation features of snowstorms in Inner Mongolia are analysed.