Leave-twigs of cajuput is used economically as raw material for the cajuput oil industry. However, the role of cajuput’s leave-twigs to produce environmental services like carbon storage is a lack of research. This study aim is determining the potential of carbon storage in leave-twigs of cajuput that are ready to be harvested. The research equipment are digital scales, compass, and knife. The research material is cajuput stand at several ages at KPH Yogyakarta. The results showed that at compartment 31 of KPH Yogyakarta were dominated by stand on age 23 years (52%) which the carbon storage was 545,6 gr/tree. Cajuput stand that produces the higher carbon storage was the stand in which the age is 33 years. The carbon storage at age 23 years is 807,7 gr/tree and the stand density is 2.325 trees/ha. The total leave-twigs’ carbon storage at age of 23, 27, 31, 33, 40, 41, 43 are 36,5 tons, 1,58 tons, 10,70 tons, 2,83 tons, 3,61 tons, and 5,90 tons respectively. Thus, the potential of total carbon storage in cajuput’s leave-twigs at compartment 31 is 65,04 tons.