Abstract: Estimation was made on forest carbon storage and density in Yunnan province based on continuous inventory for national forest resources in 2008 and 2013， by biomass extension factors and with forest age structure， type and origin. The results showed that forest carbon storage in Yunnan in 2008 was 798.31×106 t and increased to 831.81×106 t in 2013. Inventory in 2013 demonstrated that carbon storage of different forest types increased except shrub， but carbon density decreased from 49.98 t/ha in 2008 to 39.78t/ha. The forest carbon storage of the plantation had a significant change， instead， of the natural forest， increased by only 23.02×106 t during 5 years. Forest carbon storage could be increased by more plantation area， which is not sustainable for Yunnan province.