Abstract: Based on the data of biomass at five different stand ages, i.e., young forest, middleaged forest, pre-mature forest, mature forest and overmature forest, the carbon storage and distribution patterns of hardwood broadleaved forests at different ages in Guangxi were studied. The results showed that the total carbon storage of the hardwood broadleaved forest ecosystems presented in the order of overmature forest (514.44 t·hm^-2), mature forest (439.92 t·hm^-2), young forest (325.29 t·hm^-2), middleaged forest (315.27 t·hm^-2), and premature forest (214.64 t·hm^-2). The carbon storage distribution of different stand ages was in the order of soil layer > vegetation layer > litterfall layer, and belowground part > aboveground part. The carbon storage of the vegetation layer ranged from 79.12 to 179.17 t·hm^-2, which accounted for 23.09%-43.84% of the total carbon storage and increased with stand age. The carbon storage of litterfall ranged from 0.91 to 2.32 t·hm^-2, which accounted for 0.21%-0.76% of the total carbon storage and showed a “W” type variation with the increasing age. The carbon storage of soil layer ranged from 120.55 to 335.27 t·hm^-2, which decreased firstly and then increased with the increasing age and accounted for 56.16%-76.91% of the total carbon storage. The maximum carbon storage of vegetation layer was tree layer (ranging from 72.35 to 173.07 t·hm^-2), which accounted for 28.92%-76.58% of the tree layer carbon storage and increased with stand age. The maximum carbon storage of the tree layer was trunk (ranging from 44.99 to 110.87 t·hm^-2), which accounted for 17.98%-47.77% of the carbon storage of tree layer and increased with stand age. The proportion of root, branch and leaf accounted for 4.46%-11.82%, 4.52%-11.90%, and 1.95%-5.09% respectively, and increased with stand age.