Abstract: Based on the forest inventory data of 1995,2000 and 2005 in Shanxi province,China,the biomass forest carbon storage and its change pattern during this period were investigated by using the variable BEF (Biomass Expansion Factor) method.The result showed that the forest biomass carbon storage within these years increased steadily.The total forest biomass carbon storage increased from 35.1422×10⁶Mg in 1995 to 45.0561×10⁶Mg in 2005.Deciduous oaks,Pinus tabulaefomis and Populus spp.were the main dominant tree species,and they made more than 90% of the contribution to the total carbon storage.The carbon storage of young,middle-aged and premature forests accounted approximately for 90% of the total carbon storage of all forests.The percentage of carbon storage of man-made forests increased 5.28% in 2005.The average carbon density of the forests in Shanxi was 23.8933～26.3717MgC ha^-1.

Key words: biomass, carbon storage, carbon density, Shanxi Province