We used the IPCC method to calculate the forest carbon storage in Hulunbuir area of Inner Mongolia with the forest inventory data. The forest carbon storage in Hulunbuir area was 5.39*10~8t.Timber forest followed by shelter forest had the highest carbon storage, accounting for 85% and 11% of total carbon storage, respectively. Larix gmelinii and silver birch accounted for 88% of total carbon storage in 11 dominant tree species,and the forest carbon storage differed considerably between various dominant tree speices. In different-aged group of timber forest,middle-aged forest resulted in the highest carbon storage,but the carbon density increased with the increasing of forest age,and over-aged forest had the highest carbon sink capacity. Middle-aged and young forest tending and management, the quality of forest, the capacity of carbon sink and coping with climate change could be improved by forest resource cultivation and protection projects.