Abstract: By using the precipitation data of 40 years from1971-2010, the rainstorm amount was statisticed and analysed of 16 observation station of Hulunbeier city,the result showed that：The rainstorm amount of the east in the Great Xing＇an Mountain were more than of the west significantly,and heavy rainstorm amount appeared only in observation station of the east in the Mountain （No including regional Automatic station ）,having clear locality;The rainstorm mainly occured from Jun to Aug,the peak appeared Jul, the rainstorm appeared in May and September in the east of the Mountain;The varying characteristics of annual took on wavy characteristic,the change regulation appeared little-much-much-still less;The annual rainstorm amount had a clear positive correlation with the annual precipitation;There were three weather typies causing of rainstorm in Hulunbeier city.