Increasing concentrations of greenhouse gases like carbon dioxide (CO2),methane (CH4),nitrous oxide (N2O), hydrofluorocarbons (HFC),perfluorocarbons (PFC)and sulfur hexafluoride (SF6) in the atmosphere already have environmental impacts caused by rising air temperature at the earth. Forests can absorb greenhouse gases by way of transforming CO2 from the air to deposit the carbon stored in trees. This research use Eucalyptus IND 61 as material research which is this clon is derivative or hybrid clon from Eucalyptus grandis and Eucalyptus urophylla. The objective of this research are (1) estimating potency of biomass and carbon mass from Eucalyptus IND 61 age 5 years; (2) analyzing the differences in carbon content of stems, twigs and leaves from Eucalyptus IND 61 age 5 years; (3) getting the allometric model to estimating carbon stocks potential of Eucalyptus IND 61 age 5 years. The research was carried out in two stages, namely the first stage were to data in the field and the second stage was analyze of carbon biomass and plant in the laboratory. Parameters measured in the field was wet weight, whereas in the laboratory is measured moisture content, volatile matter content, ash content and carbon content. The results of the case study on Eucalyptus IND 61 age 5 years stands, showed that there is a differences in carbon content of stems, twigs and leaves. The highest carbon mass is in the main stem of the tree, and the lowest is in the twigs. The best model allometric equations for estimating biomass and carbon mass of Eucalyptus IND 61 age 5 years was W=47.238-68.109D+2.675D2 and C=25.712-37.647D+1.474D2 (W=biomass; C=carbon mass; D=diameter), resulting in biomass and carbon mass of Eucalyptus IND 61 age 5 years 100.21 ton/ha and 47.08 ton/ha respectively. 121201152