Based on located observations biomass and carbon content carbon of plants from a national key field scientific experimental station in Huitong, carbon storage, carbon allocation characteristics of each component in Chinese fir (Cunninghamia lanceolata) plantations, the ability to stand fixed carbon dynamics in Cinese fir plantation at different ages were studied. The results showed that the carbon content of the Stand components increased with the age, which in the ranked as follow: needle > bark > root > trunk > twig at the same age. Forest carbon storage ranged from 22.93 to 86.98 t/hm²,the carbon storage is greater in tree layer than the understory vegetation layer, and the understory vegetation layer is greater than the layer of dead matter. Tree layer of carbon on the relative distribution of organs ranked as trunk > root > leaf > bark > branch. Trunk carbon allocation to increase with age, branches, leaves decrease with age, although the roots and bark fluctuated, the change is relatively stable. The needle, twig,trunk, bark, roots carbon accumulation, the average annual change showed a single peak-shaped curve, but the crest of a different time. The fixed carbon dynamic characteristics can be divided into five stages of the fir forest, i.e. the establishment of the function of the fixed carbon, carbon fixation ability to rapidly increase, the ability to achieve maximum fixed carbon, the ability of the fixed carbon is relatively stable, decreased ability of the fixed carbon. The Carbon sequestration in Chinese fir plantations is affected not only by the constraints of the biological characteristics of the different growth stages of growth and development rhythm, but also by the stand canopy structure and soil fertility conditions.